Submission #899126

#	Time	Username	Problem	Language	Result	Execution time	Memory
899126		otarius	Red-blue table (IZhO19_stones)	C++17	100 / 100	25 ms	2384 KiB

stones

#pragma GCC optimize("Ofast")
#pragma GCC target ("sse4")
#include <map>
#include <set>
#include <cmath>
#include <queue>
#include <vector>
#include <iomanip>
#include <cstring>
#include <limits.h>
#include <iostream>
#include <string.h>
#include <algorithm>
using namespace std;

#define ff first
#define sc second
#define pb push_back
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define ull unsigned long long

const ll inf = 1e18;
const ll mod = 1e9 + 7;
const ll wmod = 998244353;
#define int long long

void solve(){
    int n, m;
    cin >> n >> m;
    char a[n + 1][m + 1];
    if (n >= m){
        for (int i = 1; i <= n; i++){
            for (int j = 1; j <= m; j++){
                a[i][j] = '+';
            }
        }
        int arr[n + 1] = {};
        int l = 1, i = 1, cnt = n / 2 + 1, cur = 0;
        while(i <= m){
            if (arr[l] < (m - 1) / 2){
                a[l][i] = '-'; arr[l]++; cur++;
            }else break;
            if (cur % cnt == 0)i++;
            if (l == n)l = 1;
            else l++;
        }
    }else {
        for (int i = 1; i <= n; i++){
            for (int j = 1; j <= m; j++){
                a[i][j] = '-';
            }
        }
        int arr[m + 1] = {};
        int l = 1, i = 1, cnt = m / 2 + 1, cur = 0;
        while(i <= n){
            if (arr[l] < (n - 1) / 2){
                a[i][l] = '+'; arr[l]++; cur++;
            }else break;
            if (cur % cnt == 0)i++;
            if (l == m)l = 1;
            else l++;
        }
    }
    int ans = 0;
    for (int i = 1; i <= n; i++){
        int cnt = 0;
        for (int j = 1; j <= m; j++){
            cnt += (a[i][j] == '+');
        }
        if (cnt > m - cnt)ans++;
    }
    for (int j = 1; j <= m; j++){
        int cnt = 0;
        for (int i = 1; i <= n; i++){
            cnt += (a[i][j] == '-');
        }
        if (cnt > n - cnt)ans++;
    }
    cout << ans << '\n';
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= m; j++){
            cout << a[i][j];
        }cout << '\n';
    }
    /*
        --+++
        -+-++
        -+-++
        -+-++
        +--++
        +-+-+
        +-+-+
    
    */
}
int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);

    ll T = 1;
    cin >> T;
    while(T--){
        solve();
    }
    return 0;
}

• Subtask 1: 17 / 17
• Subtask 2: 10 / 10
• Subtask 3: 16 / 16
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 31 / 31