Submission #308769

#	Time	Username	Problem	Language	Result	Execution time	Memory
308769		nikatamliani	Red-blue table (IZhO19_stones)	C++14	15 / 100	45 ms	1664 KiB

stones

#include <bits/stdc++.h>
using namespace std;
int main() {
    int T = 1;
    cin >> T;
    while(T--) {
        int n, m, cntI = 0, best = 0;
        cin >> n >> m; 
        bool ans[n + 1][m + 1];
        memset(ans, 0, sizeof ans);
        for(int i = 0; i <= n; ++i) {
            int sum = i * (m / 2 + 1);
            int cnt_less = m - sum % m;
            int cnt_more = sum % m;
            int less = sum / n;
            int more = less + 1; 
            int rem = n * m - sum, now = i;
            int can = (n - 1) / 2, have = n - can;
            sum = max(0, sum - can * m);
            now += m - (sum + have - 1) / have;
            if(best < now) {
                best = now, cntI = i;
            }
        }
        int prev = 1;
        for(int i = 1; i <= cntI; ++i) {
            int cnt = m / 2 + 1;
            for(int j = prev; cnt--; j = (j == m ? 1 : j + 1)) {
                prev = (j == m ? 1 : j + 1);
                ans[i][j] = 1;
            }
        }
        cout << best << '\n';
        vector < int > row(n + 1), col(m + 1);
        for(int i = 1; i <= n; ++i) {
            for(int j = 1; j <= m; ++j) {
                if(ans[i][j]) {
                    cout << '+';
                    ++row[i]; --col[j];
                } else {
                    cout << '-';
                    --row[i]; ++col[j];
                }
            }
            cout << '\n';
        }
    }
}

Compilation message (stderr)

stones.cpp: In function 'int main()':
stones.cpp:13:17: warning: unused variable 'cnt_less' [-Wunused-variable]
   13 |             int cnt_less = m - sum % m;
      |                 ^~~~~~~~
stones.cpp:14:17: warning: unused variable 'cnt_more' [-Wunused-variable]
   14 |             int cnt_more = sum % m;
      |                 ^~~~~~~~
stones.cpp:16:17: warning: unused variable 'more' [-Wunused-variable]
   16 |             int more = less + 1;
      |                 ^~~~
stones.cpp:17:17: warning: unused variable 'rem' [-Wunused-variable]
   17 |             int rem = n * m - sum, now = i;
      |                 ^~~

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