Submission #395743

#	Time	Username	Problem	Language	Result	Execution time	Memory
395743		ly20	Red-blue table (IZhO19_stones)	C++17	0 / 100	69 ms	1844 KiB

stones

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1123;
int tb[MAXN][MAXN];
int sl[MAXN], sc[MAXN];
int n, m;
bool teste(int a, int b) {
    if(a > n || b > m) return false;
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= m; j++) {
            tb[i][j] = 0;
            sl[i] = m;
            sc[j] = 0;
        }
    }
    bool ok = true;
    for(int i = n; i > n - a; i--) {
        for(int j = 1; j <= m; j++) {
            tb[i][j] = 1;
            sl[i]--;
            sc[j]++;
        }
    }
    for(int j = m; j > m - a; j--) {
        for(int i = n; i >= 1; i--) {
            tb[i][j] = 0;
            sl[i]++;
            sc[j]--;
        }
    }
    int l = n - a, c = m - b;
    int liml = m / 2 + 1, limc = n / 2 + 1;
    if(l == 0 || c == 0) return true;
    for(int i = 1; i <= l; i++) {
        int qtdisp = sl[i] - liml;
        for(int j = 1; j <= c; j++) {
            if(qtdisp > 0 && sc[j] < limc) {
                qtdisp--;
                sc[j]++;
                tb[i][j] = 1;
                sl[i]--;
            }
        }
    }
    for(int i = 1; i <= c; i++) if(sc[i] < limc) ok = false;
    return ok;
}
int main() {
    int t;
    scanf("%d", &t);
    while(t--) {
        scanf("%d %d", &n, &m);
        for(int i = 1; i <= n; i++) {
            for(int j = 1; j <= m; j++) {
                tb[i][j] = 0;
                sl[i] = m;
                sc[j] = 0;
            }
        }
        if(n == 1) {
            printf("%d\n", m);
            for(int i = 0; i < m; i++) printf("-");
            printf("\n");
            continue;
        }
        else if(m == 1) {
            printf("%d\n", n);
            for(int i = 0; i < n; i++) printf("+\n");
            continue;
        }
        bool ok = false;
        int resp = 0;
        for(int i = 1; i < 5; i++) {
            for(int j = 0; j <= i; j++) {
                if(ok) continue;
                ok = teste(j, i - j);
                if(ok) resp = i;
            }
        }
        printf("%d\n", m + n - resp);
        for(int i = 1; i <= n; i++) {
            for(int j = 1; j <= m; j++) {
                if(tb[i][j] == 0) printf("+");
                else printf("-");
            }
            printf("\n");
        }
    }
}

Compilation message (stderr)

stones.cpp: In function 'int main()':
stones.cpp:50:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   50 |     scanf("%d", &t);
      |     ~~~~~^~~~~~~~~~
stones.cpp:52:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   52 |         scanf("%d %d", &n, &m);
      |         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 10
• Subtask 3: 0 / 16
• Subtask 4: 0 / 11
• Subtask 5: 0 / 15
• Subtask 6: 0 / 31