Codeforces Round #644 (Div. 3)

题目传送门

A. Minimal Square

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, a, b) for (register int i = a; i <= b; i++)

int a, b;
void solve()
{
    cin >> a >> b;
    if (a < b)
        swap(a, b);
    cout << max(a * a, b * b * 4) << endl;
}
int main()
{
    int t = 1;
    cin >> t;
    while (t--)
    {
        solve();
    }
}

B. Honest Coach

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, a, b) for (register int i = a; i <= b; i++)

int n, a[60], ans;
void solve()
{
    cin >> n;
    ans = 1010;
    rep(i, 1, n) cin >> a[i];
    sort(a + 1, a + n + 1);
    rep(i, 1, n - 1) ans = min(ans, a[i + 1] - a[i]);
    cout << ans << endl;
}
int main()
{
    int t = 1;
    cin >> t;
    while (t--)
    {
        solve();
    }
}

C. Similar Pairs

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, a, b) for (register int i = a; i <= b; i++)

int n, a[60], cnt, flag;
void solve()
{
    cin >> n;
    cnt = flag = 0;
    rep(i, 1, n) cin >> a[i];
    sort(a + 1, a + n + 1);
    a[n + 1] = 0;
    rep(i, 1, n)
    {
        if (a[i + 1] - a[i] == 1)
            flag = 1;
        if (a[i] % 2)
            cnt++;
    }
    if (flag || cnt % 2 == 0)
        puts("YES");
    else
        puts("NO");
}
int main()
{
    int t = 1;
    cin >> t;
    while (t--)
    {
        solve();
    }
}

D. Buying Shovels

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, a, b) for (register int i = a; i <= b; i++)

ll n, k, ans;
void solve()
{
    cin >> n >> k;
    ans = 0;
    for (ll i = 1; i * i <= n; i++)
        if (n % i == 0)
        {
            if (i <= k)
                ans = max(ans, i);
            if (n / i <= k)
                ans = max(ans, n / i);
        }
    cout << n / ans << endl;
}
int main()
{
    int t = 1;
    cin >> t;
    while (t--)
    {
        solve();
    }
}

E. Polygon

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, a, b) for (register int i = a; i <= b; i++)

ll n, mp[60][60];
char f;
int flag = 1;
void solve()
{
    cin >> n;
    flag = 1;
    rep(i, 1, n) rep(j, 1, n)
    {
        cin >> f;
        mp[i][j] = f == '1';
    }
    rep(i, 1, n) rep(j, 1, n) if (i != n && j != n && mp[i][j] && !(mp[i + 1][j] || mp[i][j + 1])) flag = 0;
    puts(flag ? "YES" : "NO");
}
int main()
{
    int t = 1;
    cin >> t;
    while (t--)
    {
        solve();
    }
}

F. Spy-string

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, a, b) for (register int i = a; i <= b; i++)

int n, m;
char mp[60][60], f;
char ans[60];
int flag = 1, cnt;
void solve()
{
    cin >> n >> m;
    flag = 1;
    rep(i, 1, n) rep(j, 1, m) cin >> mp[i][j];
    memset(ans, 0, sizeof(ans));
    rep(i, 1, m) ans[i] = mp[1][i];
    rep(i, 1, m) for (f = 'a'; f <= 'z'; f++)
    {
        ans[i] = f;
        cnt = 0;
        rep(j, 2, n)
        {
            cnt = 0;
            rep(k, 1, m) if (ans[k] != mp[j][k])
                cnt++;
            if (cnt > 1)
                break;
        }
        if (cnt < 2)
        {
            cout << ans + 1 << endl;
            return;
        }
        ans[i] = mp[1][i];
    }
    puts("-1");
}
int main()
{
    int t = 1;
    cin >> t;
    while (t--)
    {
        solve();
    }
}