Submission #899028

#	Time	Username	Problem	Language	Result	Execution time	Memory
899028		otarius	Red-blue table (IZhO19_stones)	C++17	0 / 100	19 ms	1372 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 x = 0, y = 0;
        for (int j = 1; j < m - j; j++){
            for (int i = 1; true; i++){
                a[i][j] = '-';
                x = max(x, i);
                y = max(y, j);
                if (i > n - i)break;
            }
        }
        if (m % 2 == 0){
            for (int i = n; i >= x; i--){
                for (int j = m; j >= y; j--){
                    a[i][j] = '-';
                }
            }
        }
    }else {
        for (int i = 1; i <= n; i++){
            for (int j = 1; j <= m; j++){
                a[i][j] = '-';
            }
        }
        int x = 0, y = 0;
        for (int i = 1; i < n - i; i++){
            for (int j = 1; true; j++){
                a[i][j] = '+';
                x = max(x, i);
                y = max(y, j);
                if (j > m - j)break;
            }
        }
        if (n % 2 == 0){
            for (int i = n; i > x; i--){
                for (int j = m; j > y; j--){
                    a[i][j] = '+';
                }
            }
        }
    }
    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: 0 / 17
• Subtask 2: 0 / 10
• Subtask 3: 0 / 16
• Subtask 4: 0 / 11
• Subtask 5: 0 / 15
• Subtask 6: 0 / 31