Acwing第132场周赛

AcWing 5366. 大小写转换

#include <bits/stdc++.h> 
#define ls p<<1
#define rs p<<1|1
#define PII pair<int, int>
#define ll long long
#define db double
#define ull unsigned long long
#define endl '\n'
#define io ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
using namespace std;
const int N = 2e5 + 10;
int t, n;
int a[N], sum[N], b[N];

void solve()
{
    string a, b;
    cin >> a;
    for(int i = 0; i < a.size(); ++ i)  a[i] = tolower(a[i]);
    cout << a;
}

int main()
{
    io
//  freopen("1.in", "r", stdin);
//  cin >> t;
//  while(t --) 
    solve(); 
    return 0;
}

AcWing 5367. 不合群数

#include <bits/stdc++.h> 
#define ls p<<1
#define rs p<<1|1
#define PII pair<int, int>
#define ll long long
#define db double
#define ull unsigned long long
#define endl '\n'
#define io ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
using namespace std;
const int N = 2e5 + 10;
int t, n;
int a[N], sum[N], b[N], ans;
map<int, int>mp;

void solve()
{
    int a, b; cin >> a >> b;
    for(int i = b; i > a; -- i)
    {
        bool success = true;
        for(int j = 2; j <= a &&  j * j <= i; ++ j)
        {
            if(i % j == 0)
            {
                success = false;
                break;
            }
        }
        if(success)
        {
            cout << i << endl;
            return;
        }
    }
    cout << -1 << endl;
}

int main()
{
    io
//  freopen("1.in", "r", stdin);
//  cin >> t;
//  while(t --) 
    solve(); 
    return 0;
}

AcWing 5368. 最短距离

#include <bits/stdc++.h> 
#define ls p<<1
#define rs p<<1|1
#define PII pair<int, int>
#define ll long long
#define db double
#define ull unsigned long long
#define endl '\n'
#define io ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define INF 0x3f3f3f3f
using namespace std;
const int N = 1e5 + 10;
int t, n, m, q;
int fa[N], d[510][510], id[N];

int find(int x)
{
    if(x == fa[x])  return x;
    return fa[x] = find(fa[x]);
}

bool check()
{
    for(int i = 2; i <= n; ++ i)
        if(id[i] == id[i - 1] && find(i) != find(i - 1))    return false;
    return true;
}

void solve()
{
    cin >> n >> m >> q;
    for(int i = 1; i <= n; ++ i)    fa[i] = i;  
    memset(d, 0x3f, sizeof(d)); 
    for(int i = 1, j = 1; i <= q; ++ i)
    {
        int cnt; cin >> cnt;
        while(cnt --)   id[j ++] = i; 
    }
    for(int i = 1; i <= m; ++ i)
    {
        int x, y, w;    cin >> x >> y >> w;
        if(!w)  fa[find(x)] = find(y);
        x = id[x], y = id[y];
        d[y][x] = d[x][y] = min(d[x][y], w);
    }

    if(!check())
    {
        cout << "No" << endl;
        return;
    }

    for(int k = 1; k <= q; ++ k)
        for(int i = 1; i <= q; ++ i)
            for(int j = 1; j <= q; ++ j)
            {
                d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
                if(i == j)  d[i][j] = d[j][i] = 0;
            }


    cout << "Yes" << endl;
    for(int i = 1; i <= q; ++ i)
    {
        for(int j = 1; j <= q; ++ j)
        {
            int dist = d[i][j];
            if(dist == INF) cout << -1 << ' ';
            else    cout << dist << ' ';

        }
        cout << endl;
    }
}

int main()
{
    io
//  freopen("1.in", "r", stdin);
//  cin >> t;
//  while(t --) 
    solve(); 
    return 0;
}