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OI模板库

时间:2023-10-25 18:45:41浏览次数:29  
标签:return OI int tr flow push inline 模板

有时间就加一点吧....

Tarjan

namespace Tarjan{
	int col[N],num[N],dfn[N],low[N],cnt,colornum,val[N];
	bool ins[N];
	stack<int>s;
	vector<int>g[N];
	vector<int>e[N];
	int a[N];
	inline void tarjan(int u){
		dfn[u]=low[u]=++cnt;
		s.push(u);ins[u]=1;
		for(auto v:g[u]){
			if(!dfn[v]){
				tarjan(v);
				low[u]=min(low[u],low[v]);
			}
			else if(ins[v])low[u]=min(low[u],dfn[v]);
		}
		if(dfn[u]==low[u]){
			int t;
			colornum++;
			do{
				t=s.top();s.pop();
				col[t]=colornum;
				num[colornum]++;
				val[colornum]+=a[t];
				ins[t]=0;
			}while(t!=u);
		}
	}
}using namespace Tarjan;

树链剖分求LCA

code

struct treelca{
	int siz[N],son[N],fa[N],dep[N],top[N];
	inline void dfs1(int u,int from){
		siz[u]=1;son[u]=0;
		dep[u]=dep[from]+1;
		for(auto v:g[u]){
			if(v==from) continue;
			fa[v]=u;dfs1(v,u);
			if(siz[v]>siz[son[u]])son[u]=v;
			siz[u]+=siz[v];
		}
	}
	inline void dfs2(int u,int tp){
		top[u]=tp;
		if(son[u]!=0) dfs2(son[u],tp);
		for(auto v:g[u]){
			if(v==fa[u]||v==son[u]) continue;
			dfs2(v,v);
		}
	}
	inline int lca(int x,int y){
		while(top[x]!=top[y]){
			if(dep[top[x]]>dep[top[y]])x=fa[top[x]];
			else y=fa[top[y]];
		}
		return dep[x]<dep[y]?x:y;
	}
}T;

矩阵快速幂

code

struct mat{
    int a[15][15];
    mat(){memset(a,0,sizeof a);}
    inline mat operator*(const mat& rhs)const {
        mat res;
        up(i,1,2){
            up(j,1,2){
                up(k,1,2){
                    res.a[i][j]=(res.a[i][j]+a[i][k]*rhs.a[k][j])%p;
                }
            }
        }
        return res;
    }
};
inline mat ksm(mat rhs,int k){
    mat base;
    up(i,1,2)base.a[i][i]=1;
    while(k){
        if(k&1)base=base*rhs;
        rhs=rhs*rhs;
        k>>=1;
    }
    return base;
}

FHQTreap

code

struct FHQTreap{
    int cnt=0,root=0;
    struct node{
        int ls,rs;
        int key,pri;
        int siz;
    }tr[N];
    int ans;
    inline void build(int x){
        cnt++;
        tr[cnt].siz=1;
        tr[cnt].ls=tr[cnt].rs=0;
        tr[cnt].key=x;
        tr[cnt].pri=rand();
    }
    inline void push_up(int k){
        tr[k].siz=tr[tr[k].ls].siz+tr[tr[k].rs].siz+1;
    }
    inline void split(int u,int x,int &l,int &r){
        if(u==0){l=r=0;return;}
        if(tr[u].key<=x){
            l=u;
            split(tr[u].rs,x,tr[u].rs,r);
        }
        else{
            r=u;
            split(tr[u].ls,x,l,tr[u].ls);
        }
        push_up(u);
    }
    inline int merge(int l,int r){
        if(l==0||r==0)return l+r;
        if(tr[l].pri>tr[r].pri){
            tr[l].rs=merge(tr[l].rs,r);
            push_up(l);
            return l;
        }
        else{
            tr[r].ls=merge(l,tr[r].ls);
            push_up(r);
            return r;
        }
    }
    inline void insert(int x){
        int l,r;
        split(root,x,l,r);
        build(x);
        root=merge(merge(l,cnt),r);
    }
    inline void del(int x){
        int l,r,p;
        split(root,x,l,r);
        split(l,x-1,l,p);
        p=merge(tr[p].ls,tr[p].rs);
        root=merge(merge(l,p),r);
    }
    inline void getrank(int x){
        int l,r;
        split(root,x-1,l,r);
        int last=tr[l].siz+1;
        root=merge(l,r);
    } 
    inline int kth(int u,int k){
        if(k==tr[tr[u].ls].siz+1)return u;
        if(k<=tr[tr[u].ls].siz)return kth(tr[u].ls,k);
        else return kth(tr[u].rs,k-tr[tr[u].ls].siz-1);
    }
    inline int getpre(int x){
        int l,r;
        split(root,x-1,l,r);
        int last=tr[kth(l,tr[l].siz)].key;
        root=merge(l,r);
        return last;
    }
    inline int getpre1(int x){
        int l,r;
        split(root,x,l,r);
        int last=tr[kth(l,tr[l].siz)].key;
        root=merge(l,r);
        return last;
    }
    inline int getnxt(int x){
        int l,r;
        split(root,x,l,r);
        int last=tr[kth(r,1)].key;
        root=merge(l,r);
        return last;
    }
    inline int size(){
        return tr[root].siz;
    }
    inline int getans(int x){
        int a=getpre1(x),b=getnxt(x);
        if(x-a>b-x)return b;
        else return a;
    }
}

文艺平衡树

int n,m;
int a[N];
struct FHQTreap{
    struct node{
        int ls,rs;
        int val,key;
        int siz,tag;
    }tr[N];
    int rt=0,cnt=0;
    inline void push_up(int k){
        tr[k].siz=tr[tr[k].ls].siz+tr[tr[k].rs].siz+1;
    }
    inline int nd(int x){
        cnt++;
        tr[cnt].val=x;
        tr[cnt].key=rng();
        tr[cnt].siz=1;
        return cnt;
    }
    inline void push_down(int k){
        if(tr[k].tag){
            tr[tr[k].ls].tag^=1;
            tr[tr[k].rs].tag^=1;
            swap(tr[k].ls,tr[k].rs);
            tr[k].tag=0;
        }
    }
    inline void split(int u,int x,int &L,int &R){
        if(!u)return L=R=0,void();
        push_down(u);
        if(tr[tr[u].ls].siz>=x)R=u,split(tr[u].ls,x,L,tr[u].ls);
        else L=u,split(tr[u].rs,x-tr[tr[u].ls].siz-1,tr[u].rs,R);
        push_up(u);
    }
    inline int merge(int L,int R){
        if(!L||!R)return L|R;
        push_down(L);
        push_down(R);
        if(tr[L].key>tr[R].key){
            tr[L].rs=merge(tr[L].rs,R);
            push_up(L);
            return L;
        }
        else{
            tr[R].ls=merge(L,tr[R].ls);
            push_up(R);
            return R;
        }
    }
    inline void insert(int x){
        rt=merge(rt,nd(x));
    }
    inline void rev(int l,int r){
        int x,y,z;
        split(rt,r,x,z);
        split(x,l-1,x,y);
        tr[y].tag^=1;
        rt=merge(x,merge(y,z));
    }
    inline void print(int x){
        if(!x)return; 
        push_down(x),
        print(tr[x].ls);
        cout<<tr[x].val<<" ";
        print(tr[x].rs);
    }
}T;
signed main(){
	n=read();m=read();
	up(i,1,n)T.insert(i);
    int l,r;
    up(i,1,m){
        l=read();r=read();
        T.rev(l,r);
    }
    T.print(T.rt);
    return 0;
}

线段树

code

struct SegmentTree{
	struct node{
		int l,r,maxl;
	}tr[N<<2];
	inline void push_up(int k){
		tr[k].maxl=max(tr[lc].maxl,tr[rc].maxl);
	}
	inline void build(int k,int l,int r,int arr[]){
		tr[k].l=l;tr[k].r=r;
		if(l==r){
			tr[k].maxl=arr[l];
			return;
		}
		int mid=(l+r)>>1;
		build(lc,l,mid,arr);
		build(rc,mid+1,r,arr);
		push_up(k);
	}
	inline int ask(int k,int l,int r){
		if(tr[k].l>=l&&tr[k].r<=r){
			return tr[k].maxl;
		}
		int mid=(tr[k].l+tr[k].r)>>1,res=-inf;
		if(mid>=l)res=max(res,ask(lc,l,r));
		if(mid<r)res=max(res,ask(rc,l,r));
		return res;
	}
};

ST表

code

struct ST{
    int dp[N][20],pos[N][20];
    inline void build(int l,int r,int arr[]){
        up(i,l,r)dp[i-l+1][0]=arr[i];
        up(i,l,r)pos[i][0]=i;
        int res=0;
        for(int j=1;(1<<j)<=r-l+1;j++){
            for(int i=l;i+(1<<j)-1<=r;i++){
                int x=pos[i-l+1][j-1],y=pos[i-l+1+(1<<(j-1))][j-1];
                dp[i-l+1][j]=max(dp[i-l+1][j-1],dp[i-l+1+(1<<(j-1))][j-1]);
                pos[i-l+1][j]=arr[x]>arr[y]?x:y;
            }
        }
    }
    inline int ask(int l,int r){
        int k=log2(r-l+1);
        return max(dp[l][k],dp[r-(1<<k)+1][k]);
    }
    inline int askpos(int l,int r,int arr[]){
        int k=log2(r-l+1);
        int x=pos[l][k],y=pos[r-(1<<k)+1][k];
        return arr[x]>arr[y]?x:y;
    }
}T;

并查集

namespace DSU{
    int fa[N], siz[N];
    void init(int n) {
        for(int i = 1; i <=n; i++) fa[i] = i, siz[i] = 1;
    }
    int find(int x) {
        return fa[x] == x ? fa[x] : fa[x] = find(fa[x]);
    }
    void unionn(int x, int y) {
        int fx = find(x), fy = find(y);
        if(siz[fx] > siz[fy]) swap(fx, fy);
        fa[fx] = fy; siz[fy] += siz[fx];
    }
}using namespace DSU;

快读快出


namespace IO{
	inline int read(){
		char c=getchar();int x=0,fh=0;
        while(c<'0'||c>'9'){fh|=c=='-';c=getchar();}
        while(c>='0'&&c<='9'){x=(x<<1)+(x<<3)+(c^48);c=getchar();}
        return fh?-x:x;
	}
	inline void wt(int x){
		if(x<0){x=-x;putchar('-');}
		if(x>9)wt(x/10);
		putchar((x%10)^48);
	}
	inline void write(int x,bool op){
		wt(x);
		putchar(op?'\n':' ');
	}
}using namespace IO;

AC自动机

    int tr[N][26],cnt,ed[N],fail[N];
    inline void insert(char s[]){
        int len=strlen(s+1),p=0;
        up(i,1,len){
            int ch=s[i]-'a';
            if(!tr[p][ch])tr[p][ch]=++cnt;
            p=tr[p][ch];
        }
        ed[p]++;
    }
    queue<int>q;
    inline void getfail(){
        up(i,0,25)if(tr[0][i])q.push(tr[0][i]);
        while(q.size()){
            int u=q.front();q.pop();
            up(i,0,25){
                int v=tr[u][i];
                if(v){
                    fail[v]=tr[fail[u]][i];
                    q.push(v);
                }
                else tr[u][i]=tr[fail[u]][i];
            }
        }
    }
    inline int ask(char s[]){
        int len=strlen(s+1),p=0,ans=0;
        up(i,1,len){
            int ch=s[i]-'a';
            p=tr[p][ch];
            for(int v=p;v&&ed[v]!=-1;v=fail[v])ans+=ed[v],ed[v]=-1;
        }
        return ans;
    }
}T;


kmp

string a,b;
int _next[500500];
inline void getnext(string p){
	memset(_next,0,sizeof _next);
	for(int i=1;i<p.size();i++){
		int j=_next[i];
		while(j&&p[i]!=p[j])j=_next[j];
		if(p[i]==p[j])_next[i+1]=j+1;
		else _next[i+1]=0;
	}
}
inline void kmp(string s,string p){
	int j=0,res=0,last=-1;
	for(int i=0;i<s.size();i++){
		while(j&&s[i]!=p[j])j=_next[j];
		if(s[i]==p[j])j++;
		if(j==p.size()&&i-last>=p.size()){
			res++;
			last=i;
		}
	}
	printf("%d\n",res);
}

Dinic

struct Dinic{
	struct edge{
		int u,v,cap,flow;
	};
	vector<edge>edges;
	vector<int>g[N];
	int cur[N],d[N];
	bool vis[N];
	inline void add(int u,int v,int cap){
		edges.push_back({u,v,cap,0});
		edges.push_back({v,u,0,0});
		int t=edges.size();
		g[u].push_back(t-2);
		g[v].push_back(t-1);
	}
	inline bool bfs(int s,int t){
		memset(vis,0,sizeof vis);
		queue<int>q;
		q.push(s);
		d[s]=0;vis[s]=1;
		while(q.size()){
			int u=q.front();q.pop();
			for(auto i:g[u]){
				auto e=edges[i];
				if(!vis[e.v]&&e.cap>e.flow){
					vis[e.v]=1;
					d[e.v]=d[u]+1;
					q.push(e.v);
				}
			}
		}
		return vis[t];
	}
	inline int dfs(int u,int a,int t){
		if(u==t||a==0)return a;
		int flow=0,f;
		for(int &i=cur[u];i<g[u].size();i++){
			auto& e=edges[g[u][i]];
			if(d[u]+1==d[e.v]&&(f=dfs(e.v,min(a,e.cap-e.flow),t))>0){
				e.flow+=f;
				edges[g[u][i]^1].flow-=f;
				flow+=f;
				a-=f;
				if(a==0)break;
			}
		}
		return flow;
	}
	inline int maxflow(int s,int t){
		int flow=0;
		while(bfs(s,t)){
			memset(cur,0,sizeof cur);
			flow+=dfs(s,inf,t);
		}
		return flow;
	}
}E;
struct Dinic{
	struct edge{
        int u,v,cap,flow,w;
    };
    vector<edge>edges;
    vector<int>g[N];
    inline void add(int u,int v,int cap,int w){
        edges.push_back({u,v,cap,0,w});
        edges.push_back({v,u,0,0,-w});
        int t=edges.size();
        g[u].push_back(t-2);
        g[v].push_back(t-1);
    }
    bool vis[N];
    int dis[N],cur[N];
    queue<int>q;
    inline bool spfa(int s,int t){
        memset(dis,0x3f,sizeof dis);
        memset(vis,0,sizeof vis);
        dis[s]=0;vis[s]=1;
        q.push(s);
        while(q.size()){
            int u=q.front();q.pop();
            vis[u]=0;
            for(auto i:g[u]){
                auto [_,v,cap,flow,w]=edges[i];
                if(dis[v]>dis[u]+w&&cap>flow){
                    dis[v]=dis[u]+w;
                    if(!vis[v]){
                        vis[v]=1;
                        q.push(v);
                        if(dis[q.front()]>dis[q.back()])swap(q.front(),q.back());
                    }
                }
            }
        }
        return dis[t]<inf;
    }
    inline int dfs(int u,int a,int t){
        if(u==t||a==0)return a;
        vis[u]=1;
        int flow=0;
        for(int &i=cur[u];i<g[u].size();i++){
            auto &e=edges[g[u][i]];
            if(!vis[e.v]&&dis[e.v]==dis[u]+e.w&&e.cap>e.flow){
                int res=dfs(e.v,min(a,e.cap-e.flow),t);
                flow+=res;
                e.flow+=res;
                edges[g[u][i]^1].flow-=res;
                a-=res;
                if(a==0)break;
            }
        }
        vis[u]=0;
        return flow;
    }
    inline pii mincostmaxflow(int s,int t){
        int res,flow=0,cost=0;
        while (spfa(s,t)) {
            memset(cur, 0, sizeof(cur));
            while ((res=dfs(s,inf,t)))flow += res,cost += res * dis[t];
        }
        return {flow,cost};
    }
}E;

EK


struct EK{
	struct edge{
		int u,v,cap,flow;
	};
	vector<edge>edges;
	vector<int>g[N];
	int a[N],p[N];
	inline void add(int u,int v,int cap){
		edges.push_back({u,v,cap,0});
		edges.push_back({v,u,0,0});
		int t=edges.size();
		g[u].push_back(t-2);
		g[v].push_back(t-1);
	}
	inline int maxflow(int s,int t){
		int flow=0;
		for(;;){
			up(i,1,n)a[i]=0;
			queue<int>q;
			q.push(s);
			a[s]=inf;
			while(q.size()){
				int u=q.front();q.pop();
				for(auto i:g[u]){
					auto e=edges[i];
					if(!a[e.v]&&e.cap>e.flow){
						p[e.v]=i;
						a[e.v]=min(a[u],e.cap-e.flow);
						q.push(e.v);
					}
				}
				if(a[t])break;
			}
			if(!a[t])break;
			for(int u=t;u!=s;u=edges[p[u]].u){
				edges[p[u]].flow+=a[t];
				edges[p[u]^1].flow-=a[t];
			}
			flow+=a[t];
		}
		return flow;
	}
}E;
struct EK{
	struct edge{
		int u,v,cap,flow,cost;
	};
	vector<edge>edges;
	vector<int>g[N];
	int a[N],p[N];
	int vis[N];
	int dis[N];
	inline void add(int u,int v,int cap,int cost){
		edges.push_back({u,v,cap,0,cost});
		edges.push_back({v,u,0,0,-cost});
		int t=edges.size();
		g[u].push_back(t-2);
		g[v].push_back(t-1);
	}
	inline int maxflow(int s,int t){
		int flow=0;
		for(;;){
			up(i,1,n)a[i]=0;
			queue<int>q;
			q.push(s);
			a[s]=inf;
			while(q.size()){
				int u=q.front();q.pop();
				for(auto i:g[u]){
					auto e=edges[i];
					if(!a[e.v]&&e.cap>e.flow){
						p[e.v]=i;
						a[e.v]=min(a[u],e.cap-e.flow);
						q.push(e.v);
					}
				}
				if(a[t])break;
			}
			if(!a[t])break;
			for(int u=t;u!=s;u=edges[p[u]].u){
				edges[p[u]].flow+=a[t];
				edges[p[u]^1].flow-=a[t];
			}
			flow+=a[t];
		}
		return flow;
	}
	inline bool spfa(int s,int t,int &flow,int &cost){
		memset(dis,0x3f,sizeof dis);
		memset(vis,0,sizeof vis);
		memset(a,0,sizeof a);
		dis[s]=0;vis[s]=1;
		p[s]=0;a[s]=inf;
		queue<int>q;
		q.push(s);
		while(q.size()){
			int u=q.front();q.pop();
			vis[u]=0;
			for(auto i:g[u]){
				auto e=edges[i];
				if(e.cap>e.flow&&dis[e.v]>dis[u]+e.cost){
					dis[e.v]=dis[u]+e.cost;
					p[e.v]=i;
					a[e.v]=min(a[u],e.cap-e.flow);
					if(!vis[e.v]){
						q.push(e.v);
						vis[e.v]=1;
					}
				}
			}
		}
		if(dis[t]>=inf)return 0;
		flow+=a[t];
		cost+=dis[t]*a[t];
		for(int u=t;u!=s;u=edges[p[u]].u){
			edges[p[u]].flow+=a[t];
			edges[p[u]^1].flow-=a[t];
		}
		return 1;
	}
	inline int mincostmaxflow(int s,int t,int& cost){
		int flow=0;
		cost=0;
		while(spfa(s,t,flow,cost));
		return flow;
	}
}E;

lucas

inline int ksm(int a,int b){
    int res=1;
    while(b){
        if(b&1)res=res*a%mod;
        a=a*a%mod;
        b>>=1;
    }
    return res;
}
int inv[N],fac[N];
inline void init(){
    inv[0]=fac[0]=1;
    up(i,1,mod+10){
        fac[i]=fac[i-1]*i%mod;
        inv[i]=ksm(fac[i],mod-2);
    }
}
inline int C(int n,int m){
	if(n<m) return 0;
	return fac[n]*inv[m]%mod*inv[n-m]%mod;
}
inline int lucas(int n,int m){
	if(m==0) return 1;
	return (C(n%mod,m%mod)*lucas(n/mod,m/mod))%mod;
}

Z函数

int n,m;
char a[N],b[N];
int z[N],p[N];
signed main() {
	scanf("%s",a+1);
	scanf("%s",b+1);
	int lenb=strlen(b+1);
	z[1]=lenb;
	for(int i=2,l=0,r=0;i<=lenb;i++) {
		z[i]=i>r?0:min(z[i-l+1],r-i+1);
    	while(b[1+z[i]]==b[i+z[i]])z[i]++;
    	if(i+z[i]-1>r)l=i,r=i+z[i]-1;
	}
	int lena=strlen(a+1);
	for(int i=1,l=0,r=0;i<=lena;i++){
		p[i]=i>r?0:min(z[i-l+1],r-i+1);
		while(p[i]<lenb&&b[1+p[i]]==a[i+p[i]])p[i]++;
    	if(i+p[i]-1>r)l=i,r=i+p[i]-1;
	}
	int ans=0;
	up(i,1,lenb)ans^=i*(z[i]+1);
	cout<<ans<<endl;
	ans=0;
	up(i,1,lena)ans^=i*(p[i]+1);
	cout<<ans<<endl;
	return 0;
}

失配书

inline void failtree(){
        dn(i,n,1){
            siz[i]++;
            if(nxt[i])siz[nxt[i]]+=siz[i];
            if(siz[i]>=siz[son[nxt[i]]])son[nxt[i]]=i;
        }
        up(i,1,n){
            dep[i]=dep[nxt[i]]+1;
            if(son[nxt[i]]!= i)top[i] = i;
            else top[i]=top[nxt[i]];
            fa[i]=nxt[i];
        }
 }
bool vis[N];
signed main(){
    scanf("%s",s+1);
    n=strlen(s+1);
    getnxt();
    T.failtree();
    int q=read();
    int l,r;
    while(q--){
        l=nxt[read()];r=nxt[read()];
        write(T.lca(l,r),1);
    }
    return 0;
}

高斯消元

namespace gauss{
	ldb a[500][500];
	int n;
	inline void work(){
		for(int r=1,c=1;c<=n;c++,r++){
			int t=r;
			up(i,r+1,n){
				if(fabs(a[i][c])>fabs(a[t][c]))t=i;
			}
			up(i,c,n+1)swap(a[t][i],a[r][i]);
			if(!a[c][c]){
				puts("No Solution");
				exit(0);
			}
			dn(i,n+1,c)a[r][i]/=a[r][c];
			up(i,r+1,n){
				dn(j,n+1,c){
					a[i][j]-=a[i][c]*a[r][j];
				}
			}
		}
		dn(i,n,2){
			dn(j,i-1,1){
				a[j][n+1]-=a[i][n+1]*a[j][i];
				a[j][i]=0;
			}
		}
	}
	inline void print(){
		up(i,1,n){
			printf("%.3Lf ",a[i][n+1]);
		}
	}
}using namespace gauss;

线性基

namespace Linear_basis{
	int p[100],cnt,flag0=0;
	inline void insert(int x){
		if(x==0)flag0=1;
		dn(i,62,0){
			if(x&(1ll<<i)){
				if(!p[i]){
					p[i]=x;
					cnt++;
					return;
				}
				else x^=p[i];
			}
		}
	}
	inline bool ask(int x){
		dn(i,62,0){
			if(x&(1ll<<i)){
				x^=p[i];
			}
		}
		return x==0;
	}
	inline int askmax(int x) {
		int ans=x;
		dn(i,62,0)if((ans^p[i])>ans)ans^=p[i];
		return ans;
	}
	inline int askmin(int x){
		int ans=x;
		dn(i,62,0)if(ans>(p[i]^ans))ans^=p[i];
		return ans;
	}

}using namespace Linear_basis;

点分治

int n,m;
vector<pii>g[N];
int lim;
bool del[N];
inline int getsiz(int u,int from){
	if(del[u])return 0;
	int res=1;
	for(auto [v,w]:g[u]){
		if(v==from)continue;
		res+=getsiz(v,u);
	}
	return res;
}
inline int getwc(int u,int from,int tot,int&wc){
	if(del[u])return 0;
	int sum=1,maxl=0;
	for(auto [v,w]:g[u]){
		if(v==from)continue;
		int t=getwc(v,u,tot,wc);
		maxl=max(maxl,t);
		sum+=t;
	}
	maxl=max(maxl,tot-sum);
	if(maxl<=tot/2)wc=u;
	return sum;
}
inline void dfs(int u,int from,int dis,vector<int>&q){
	if(del[u])return;
	q.push_back(dis);
	for(auto [v,w]:g[u]){
		if(v==from)continue;
		dfs(v,u,dis+w,q);
	}
}
inline int get(vector<int>&a){
	sort(a.begin(),a.end());
	int res=0,len=a.size();
	for(int i=len-1,j=-1;i>=0;i--){
		while(j+1<i&&a[j+1]+a[i]<=lim)j++;
		j=min(j,i-1);
		res+=j+1;
	}
	return res;
}
inline int clac(int u){
	if(del[u])return 0;
	int res=0;
	getwc(u,0,getsiz(u,0),u);
	del[u]=1;
	vector<int>p;
	for(auto [v,w]:g[u]){
		if(del[v])continue;
		vector<int>q;
		dfs(v,u,w,q);
		res-=get(q);
		for(auto x:q){
			p.push_back(x);
			if(x<=lim)res++;
		} 
	}
	res+=get(p);
	for(auto [v,w]:g[u])res+=clac(v);
	return res;
}
signed main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	cin>>n;
	int u,v,w;
	up(i,1,n-1){
		cin>>u>>v>>w;
		g[u].push_back({v,w});
		g[v].push_back({u,w});
	}
	cin>>lim;
	cout<<clac(1)<<endl;
	return 0;
}

李超线段树

int n,last;
struct line{
    ldb k,b;
}p[N];
int cnt;
inline void add(int x0, int y0, int x1, int y1) {
    cnt++;
    if(x0==x1)p[cnt].k=0,p[cnt].b=max(y0, y1);
    else p[cnt].k=1.0*(y1-y0)/(x1-x0),p[cnt].b=y0-p[cnt].k*x0;
}
int s[N];
inline ldb calc(int id,int d) { return p[id].b+p[id].k*d;}
inline int cmp(ldb x,ldb y) {
    if(x-y>eps)return 1;
    if(y-x>eps)return -1;
    return 0;
}
inline void change(int k,int l,int r,int u){
    int &v=s[k],mid=(l+r)>>1;
    int bmid=cmp(calc(u,mid),calc(v,mid));
    if(bmid==1||(!bmid&&u<v))swap(u,v);
    int bl=cmp(calc(u,l),calc(v,l)),br=cmp(calc(u,r),calc(v,r));
    if(bl==1||(!bl&&u<v))change(lc,l,mid,u);
    if(br==1||(!br&&u<v))change(rc,mid+1,r,u);
}
inline void insert(int k,int tl,int tr,int l,int r,int u){
    if(l<=tl&&tr<=r) {
        change(k,tl,tr,u);
        return;
    }
    int mid=(tl+tr)>>1;
    if(l<=mid)insert(lc,tl,mid,l,r,u);
    if(mid<r)insert(rc,mid+1,tr,l,r,u);
}
inline pdi pmax(pdi x,pdi y){
    if(cmp(x.fi,y.fi)==-1)return y;
    else if(cmp(x.fi,y.fi)==1)return x;
    return x.se<y.se?x:y;
}
inline pdi ask(int k,int l,int r,int d){
    if (r<d||d<l)return {0,0};
    int mid=(l+r)>>1;
    db res=calc(s[k],d);
    if(l==r)return{res,s[k]};
    return pmax({res,s[k]},pmax(ask(lc,l,mid,d),ask(rc,mid+1,r,d)));
}
signed main(){
    n=read();
    int op,k,x0,y0,x1,y1;
    up(i,1,n){
        op=read();
        if(op==1){
            x0=(read()+last-1+mod1)%mod1+1;
            y0=(read()+last-1+mod2)%mod2+1;
            x1=(read()+last-1+mod1)%mod1+1;
            y1=(read()+last-1+mod2)%mod2+1;
            if (x0>x1)swap(x0,x1),swap(y0,y1);
            add(x0,y0,x1,y1);
            insert(1,1,mod1,x0,x1,cnt);
        }
        else {
            k=read();
            k=(k+last-1+mod1)%mod1+1;
            last=ask(1,1,mod1,k).second;
            cout<<(last)<<endl;
        }
    }
    return 0;
}

标签:return,OI,int,tr,flow,push,inline,模板
From: https://www.cnblogs.com/LiQXing/p/17787885.html

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