SMU Winter 2024 round 1
AB. Sum of Medians
思路:贪心的想,只有中位数有贡献,并且知道了中位数的位置以及中位数左边的数的个数 l 和中位数右边的数的个数 r ,那么对于一个不递减的数组,要取出最大的中位数,即取出l个最小的数和r个最大的数,中位数即为第r+1大的数。直到数取完为止。
#include<bits/stdc++.h> using namespace std; #define int long long //#define int __int128 #define double long double typedef pair<int,int>PII; typedef pair<string,int>PSI; typedef pair<string,string>PSS; const int N=3e5+5,INF=0x3f3f3f3f,Mod=1e9+7,mod=998244353; const int MAXN=1e8+5; const double eps=1e-6; void solve() { int n,k;cin>>n>>k; vector<int>ve(n*k+1); for(int i=1;i<=n*k;++i)cin>>ve[i]; int ans=0; int rc=n/2,lc=n-rc-1; int l=1,r=n*k; while(r-l+1>=n){ ans+=ve[r-rc]; r-=rc+1; l+=lc; } cout<<ans<<'\n'; } signed main(){ ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int t=1; cin>>t; while(t--){ solve(); } return 0; }View Code
BB. Repainting Street
思路:由于c的范围很小,直接暴力枚举每一种c需要的粉刷次数
#include<bits/stdc++.h> using namespace std; #define int long long //#define int __int128 #define double long double typedef pair<int,int>PII; typedef pair<string,int>PSI; typedef pair<string,string>PSS; const int N=3e5+5,INF=0x3f3f3f3f,Mod=1e9+7,mod=998244353; const int MAXN=1e8+5; const double eps=1e-6; void solve() { int n,k;cin>>n>>k; vector<int>ve(n); set<int>se; for(int i=0;i<n;++i){ cin>>ve[i]; se.insert(ve[i]); } int ans=INF; for(auto v:se){ int cnt=0; for(int i=0;i<n;++i){ if(ve[i]!=v)cnt++,i+=k-1; } ans=min(ans,cnt); } cout<<ans<<'\n'; } signed main(){ ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int t=1; cin>>t; while(t--){ solve(); } return 0; }View Code
CJ. Let's Play Jigsaw Puzzles!
思路:由于每个数的四个方向上的数都知道,那么找出左上角的数即可一行行枚举推出。也可以bfs或者dfs
#include<bits/stdc++.h> using namespace std; #define int long long //#define int __int128 #define double long double typedef pair<int,int>PII; typedef pair<string,int>PSI; typedef pair<string,string>PSS; const int N=3e5+5,INF=0x3f3f3f3f,Mod=1e9+7,mod=998244353; const int MAXN=1e8+5; const double eps=1e-6; int dx[4]={-1,1,0,0}; int dy[4]={0,0,-1,1}; void solve() { int n;cin>>n; int m=n*n; vector<vector<int>>ve(m+1,vector<int>(4)); int s; for(int i=1;i<=m;++i){ for(int j=0;j<4;++j){ cin>>ve[i][j]; } if(ve[i][0]==-1&&ve[i][2]==-1)s=i; } vector<vector<int>>g(n+1,vector<int>(n+1)); vector<vector<int>>st(n+1,vector<int>(n+1)); g[1][1]=s; queue<PII>q; q.push({1,1}); st[1][1]=1; while(q.size()){ auto t=q.front();q.pop(); for(int i=0;i<4;++i){ if(ve[g[t.first][t.second]][i]==-1)continue; int xx=t.first+dx[i],yy=t.second+dy[i],id=ve[g[t.first][t.second]][i]; if(!st[xx][yy]){ st[xx][yy]=1; g[xx][yy]=id; q.push({xx,yy}); } } } for(int i=1;i<=n;++i){ for(int j=1;j<=n;++j){ cout<<g[i][j]; if(j!=n)cout<<' '; } cout<<'\n'; } } signed main(){ ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int t=1; // cin>>t; while(t--){ solve(); } return 0; }View Code
DC. Bouncing Ball
思路:也是暴力枚举删除个数,由于k是不变的,那每个位置对应跳到的位置也是不变的,即用位置%k对它们进行分类,可以预处理出从每个位置开始跳后的用时
#include<bits/stdc++.h> using namespace std; #define int long long //#define int __int128 #define double long double typedef pair<int,int>PII; typedef pair<string,int>PSI; typedef pair<string,string>PSS; const int N=3e5+5,INF=0x3f3f3f3f,Mod=1e9+7,mod=998244353; const int MAXN=1e8+5; const double eps=1e-6; void solve() { int n,p,k;cin>>n>>p>>k; string s;cin>>s; int x,y;cin>>x>>y; int ans=INT32_MAX; vector<int>g(k+5); for(int i=0;i<s.size();++i){ if(i+1>=p&&s[i]=='0')g[i%k]++; } for(int i=0,st=p-1;i<n&&st<n;++i,st++){ int cnt=i*y+g[st%k]*x; ans=min(ans,cnt); g[st%k]-=s[st]=='0'; } cout<<ans<<'\n'; } signed main(){ ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int t=1; cin>>t; while(t--){ solve(); } return 0; }View Code
EC1. Binary Table (Easy Version)
思路:同下题
#include<bits/stdc++.h> using namespace std; #define int long long //#define int __int128 #define double long double typedef pair<int,int>PII; typedef pair<string,int>PSI; typedef pair<string,string>PSS; const int N=3e5+5,INF=0x3f3f3f3f,Mod=1e9+7,mod=998244353; const int MAXN=1e8+5; const double eps=1e-6; int dx[10]={-1,-1,0,1,1,1,0,-1,0}; int dy[10]={0,1,1,1,0,-1,-1,-1,0}; int d[17][3]={{},{0,6,7},{0,7,8},{0,6,8},{6,7,8}, {0,1,8},{0,1,2},{1,2,8},{0,2,8}, {5,6,8},{4,6,8},{4,5,8},{4,5,6}, {2,4,8},{2,3,8},{2,3,4},{3,4,8}}; void solve() { int n,m; cin>>n>>m; vector<vector<int>>ve(n+5,vector<int>(m+5)); for(int i=1;i<=n;++i){ string s; cin>>s; for(int j=1;j<=m;++j){ ve[i][j]=s[j-1]-'0'; } } vector<vector<PII>>ans; auto add=[&](int x,int y,int p){ vector<PII>t; for(int i=0;i<3;++i){ int xx=x+dx[d[p][i]],yy=y+dy[d[p][i]]; ve[xx][yy]^=1; t.push_back({xx,yy}); } ans.push_back(t); }; if(n%2){ for(int i=1;i<m;++i) if(ve[n][i]==1)add(n,i,5); if(ve[n][m]==1)add(n,m,2); } if(m%2){ if(ve[1][m]==1)add(1,m,9); for(int i=2;i<n;++i) if(ve[i][m]==1)add(i,m,4); if(ve[n][m]==1)add(n,m,4); } auto sum=[&](int x,int y){ return ve[x][y]+ve[x][y-1]+ve[x-1][y]+ve[x-1][y-1]; }; auto to3=[&](int x,int y){ if(ve[x][y]==0)add(x,y,1); else if(ve[x-1][y]==0)add(x,y,4); else if(ve[x][y-1]==0)add(x,y,2); else add(x,y,3); }; auto to2=[&](int x,int y){ if(ve[x][y]==1&&ve[x-1][y]==1)add(x,y,4); else if(ve[x-1][y-1]==1&&ve[x][y-1]==1)add(x,y,2); else if(ve[x-1][y-1]==1&&ve[x-1][y]==1)add(x,y,3); else if(ve[x][y-1]==1&&ve[x][y]==1)add(x,y,2); else if(ve[x-1][y-1]==1&&ve[x][y]==1)add(x,y,3); else if(ve[x][y-1]==1&&ve[x-1][y]==1)add(x,y,2); to3(x,y); }; auto to1=[&](int x,int y){ if(ve[x][y]==1)add(x,y,3); else if(ve[x][y-1]==1)add(x,y,4); else if(ve[x-1][y]==1)add(x,y,2); else add(x,y,1); to2(x,y); }; auto to4=[&](int x,int y){ add(x,y,3); to1(x,y); }; for(int i=2;i<=n;i+=2){ for(int j=2;j<=m;j+=2){ int c=sum(i,j); if(c==4)to4(i,j); else if(c==3)to3(i,j); else if(c==2)to2(i,j); else if(c==1)to1(i,j); } } cout<<ans.size()<<'\n'; for(auto v:ans){ for(int i=0;i<3;++i){ cout<<v[i].first<<' '<<v[i].second; if(i!=2)cout<<' '; } cout<<'\n'; } } signed main(){ ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int t=1; cin>>t; while(t--){ solve(); } return 0; }View Code
FC2. Binary Table (Hard Version)
思路:模拟。可以只看大小为4的正方形的情况,发现正方形的所有情况都可以在不超过4次操作变成全0。对于n或m为奇数时,对最后一行或一列直接操作变成0就好,次数平均每个格子一次
#include<bits/stdc++.h> using namespace std; #define int long long //#define int __int128 #define double long double typedef pair<int,int>PII; typedef pair<string,int>PSI; typedef pair<string,string>PSS; const int N=3e5+5,INF=0x3f3f3f3f,Mod=1e9+7,mod=998244353; const int MAXN=1e8+5; const double eps=1e-6; int dx[10]={-1,-1,0,1,1,1,0,-1,0}; int dy[10]={0,1,1,1,0,-1,-1,-1,0}; int d[17][3]={{},{0,6,7},{0,7,8},{0,6,8},{6,7,8}, {0,1,8},{0,1,2},{1,2,8},{0,2,8}, {5,6,8},{4,6,8},{4,5,8},{4,5,6}, {2,4,8},{2,3,8},{2,3,4},{3,4,8}}; void solve() { int n,m; cin>>n>>m; vector<vector<int>>ve(n+5,vector<int>(m+5)); for(int i=1;i<=n;++i){ string s; cin>>s; for(int j=1;j<=m;++j){ ve[i][j]=s[j-1]-'0'; } } vector<vector<PII>>ans; auto add=[&](int x,int y,int p){ vector<PII>t; for(int i=0;i<3;++i){ int xx=x+dx[d[p][i]],yy=y+dy[d[p][i]]; ve[xx][yy]^=1; t.push_back({xx,yy}); } ans.push_back(t); }; if(n%2){ for(int i=1;i<m;++i) if(ve[n][i]==1)add(n,i,5); if(ve[n][m]==1)add(n,m,2); } if(m%2){ if(ve[1][m]==1)add(1,m,9); for(int i=2;i<n;++i) if(ve[i][m]==1)add(i,m,4); if(ve[n][m]==1)add(n,m,4); } auto sum=[&](int x,int y){ return ve[x][y]+ve[x][y-1]+ve[x-1][y]+ve[x-1][y-1]; }; auto to3=[&](int x,int y){ if(ve[x][y]==0)add(x,y,1); else if(ve[x-1][y]==0)add(x,y,4); else if(ve[x][y-1]==0)add(x,y,2); else add(x,y,3); }; auto to2=[&](int x,int y){ if(ve[x][y]==1&&ve[x-1][y]==1)add(x,y,4); else if(ve[x-1][y-1]==1&&ve[x][y-1]==1)add(x,y,2); else if(ve[x-1][y-1]==1&&ve[x-1][y]==1)add(x,y,3); else if(ve[x][y-1]==1&&ve[x][y]==1)add(x,y,2); else if(ve[x-1][y-1]==1&&ve[x][y]==1)add(x,y,3); else if(ve[x][y-1]==1&&ve[x-1][y]==1)add(x,y,2); to3(x,y); }; auto to1=[&](int x,int y){ if(ve[x][y]==1)add(x,y,3); else if(ve[x][y-1]==1)add(x,y,4); else if(ve[x-1][y]==1)add(x,y,2); else add(x,y,1); to2(x,y); }; auto to4=[&](int x,int y){ add(x,y,3); to1(x,y); }; for(int i=2;i<=n;i+=2){ for(int j=2;j<=m;j+=2){ int c=sum(i,j); if(c==4)to4(i,j); else if(c==3)to3(i,j); else if(c==2)to2(i,j); else if(c==1)to1(i,j); } } cout<<ans.size()<<'\n'; for(auto v:ans){ for(int i=0;i<3;++i){ cout<<v[i].first<<' '<<v[i].second; if(i!=2)cout<<' '; } cout<<'\n'; } } signed main(){ ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int t=1; cin>>t; while(t--){ solve(); } return 0; }View Code
GD. Walker
思路:
HM. Gitignore
思路:将不能忽略的所有文件路径用哈希表存储,对于要忽略的,遍历其路径,直到当前找到的文件夹名不在不能忽略的哈希表存储中,若该文件夹名已在忽略名单中,则直接跳过;若不在则将其加入忽略名单,并且答案加一;
#include<bits/stdc++.h> using namespace std; #define int long long //#define int __int128 #define double long double typedef pair<int,int>PII; typedef pair<string,int>PSI; typedef pair<string,string>PSS; const int N=3e5+5,INF=0x3f3f3f3f,Mod=1e9+7,mod=998244353; const int MAXN=1e8+5; const double eps=1e-6; int dx[4]={-1,1,0,0}; int dy[4]={0,0,-1,1}; void solve() { int n,m;cin>>n>>m; vector<string>a(n),b(m); for(int i=0;i<n;++i)cin>>a[i]; for(int i=0;i<m;++i)cin>>b[i]; map<string,int>mp; for(int i=0;i<m;++i){ string c; for(int j=0;j<b[i].size();++j){ c.push_back(b[i][j]); if(b[i][j]=='/'){ mp[c]=1; } } mp[c]=1; } int ans=0; for(int i=0;i<n;++i){ string c; bool ok=false; for(int j=0;j<a[i].size();++j){ c.push_back(a[i][j]); if(a[i][j]=='/'){ if(!mp.count(c))mp[c]=2,ans++; if(mp[c]==1)continue; ok=true; break; } } if(!ok&&mp[c]!=2)ans++; } cout<<ans<<'\n'; } signed main(){ ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int t=1; cin>>t; while(t--){ solve(); } return 0; }View Code
IC. Engineer Artem
思路:一个数要与四个方向上的数不同,对矩阵整体来看,其实可以分成两批,在同一批的数可以相同,那么可以想到奇偶性,把两批的数分别变成同批同奇偶性即可
#include<bits/stdc++.h> using namespace std; #define int long long //#define int __int128 #define double long double typedef pair<int,int>PII; typedef pair<string,int>PSI; typedef pair<string,string>PSS; const int N=3e5+5,INF=0x3f3f3f3f,Mod=1e9+7,mod=998244353; const int MAXN=1e8+5; const double eps=1e-6; int dx[4]={-1,1,0,0}; int dy[4]={0,0,-1,1}; void solve() { int n,m;cin>>n>>m; vector<vector<int>>ve(n+1,vector<int>(m+1)); for(int i=1;i<=n;++i){ for(int j=1;j<=m;++j){ cin>>ve[i][j]; if(i%2){ if(j%2&&ve[i][j]%2==0)ve[i][j]++; else if(j%2==0&&ve[i][j]%2)ve[i][j]++; }else{ if(j%2&&ve[i][j]%2)ve[i][j]++; else if(j%2==0&&ve[i][j]%2==0)ve[i][j]++; } } } for(int i=1;i<=n;++i) { for(int j=1;j<=m;++j){ cout<<ve[i][j]; if(j!=m)cout<<' '; }cout<<'\n'; } } signed main(){ ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int t=1; cin>>t; while(t--){ solve(); } return 0; }View Code
JD. Good Triple
思路:可以打表看看,发现没有找到满足条件的情况的长度一定不超过8,那么对于每个l,暴力找出最小的r即可
#include<bits/stdc++.h> using namespace std; #define int long long //#define int __int128 #define double long double typedef pair<int,int>PII; typedef pair<string,int>PSI; typedef pair<string,string>PSS; const int N=3e5+5,INF=0x3f3f3f3f,Mod=1e9+7,mod=998244353; const int MAXN=1e8+5; const double eps=1e-6; void solve() { string s; cin>>s; int n=s.size(); s=' '+s; int ans=0; for(int l=1,r=l+2;r<=n;++l){ bool ok=false; while(r<=n){ for(int d=1;l+2*d<=r;++d){//间距 for(int st=l;st+2*d<=r;++st)//起点 { if(s[st]==s[st+d]&&s[st]==s[st+2*d]){ ok=true;break; } } if(ok&&r<=n){ ans+=n-r+1; break; } } if(ok)break; r++; } } cout<<ans; } signed main(){ ios::sync_with_stdio(0),cin.tie(0),cout.tie(0); int t=1; // cin>>t; while(t--){ solve(); } return 0; }View Code
标签:typedef,const,winter,int,double,day3,long,2024,define From: https://www.cnblogs.com/bible-/p/17986960