Submission #993011

#	Time	Username	Problem	Language	Result	Execution time	Memory
993011		n3rm1n	Red-blue table (IZhO19_stones)	C++17	17 / 100	17 ms	1624 KiB

stones

#include<bits/stdc++.h>
#define endl '\n'
#define ll long long
using namespace std;
const int MAXN = 55;
void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}
int n, m;
/// 1 - red
/// 0 - blue
int a[MAXN][MAXN];
int maxhappy = 0, res[MAXN][MAXN];
void check()
{
    int happy = 0;
    for (int i = 1; i <= n; ++ i)
    {
        int cnt_red = 0;
        for (int j = 1; j <= m; ++ j)
            cnt_red += a[i][j];
        if(cnt_red > m - cnt_red)
            happy ++;
    }
    for (int j = 1; j <= m; ++ j)
    {
        int cnt_blue = 0;
        for (int i = 1; i <= n; ++ i)
            cnt_blue += 1 - a[i][j];
        if(cnt_blue > n - cnt_blue)
            happy ++;
    }
    if(happy > maxhappy)
    {
        maxhappy = happy;
       // cout << "opa update" << endl;
        for (int i = 1; i <= n; ++ i)
        {
            for (int j = 1; j <= m; ++ j)
                res[i][j] = a[i][j];
        }
    }
   /** else if(happy == maxhappy)
    {
        cout << endl;
        for (int i = 1; i <= n; ++ i)
        {
            for (int j = 1; j <= m; ++ j)
                cout << res[i][j];
            cout << endl;
        }
    }*/
}
void gen(int r, int c)
{
    if(c == m+1)
    {
        c = 1;
        r ++;
    }
    if(r == n+1)
    {
        check();
        return;
    }

    a[r][c] = 1;
    gen(r, c+1);
    a[r][c] = 0;
    gen(r, c+1);
}
void solve_test()
{
    cin >> n >> m;

if(n <= 4 && m <= 4)
       {
           maxhappy = 0;
        gen(1,1);
       }
        else if(n <= 3)
        {
            memset(a, 0, sizeof(a));
            check();
            for (int i = m; i >= 1; -- i)
        {
            a[3][i] = 1;
            check();
        }
        }
        else if(m == 3)
        {
            for (int i = 1; i <= n; ++ i)
            {
                for (int j = 1; j <= m; ++ j)
                    a[i][j] = 1;
            }
            check();
            for (int j = 1; j <= n; ++ j)
            {
                a[j][m] = 0;
                check();
            }
        }

    cout << maxhappy << endl;
    for (int i = 1; i <= n; ++ i)
    {
        for (int j = 1; j <= m; ++ j)
        {
            if(res[i][j])cout << '+';
            else cout << '-';
        }
        cout << endl;
    }
}
int main()
{
    speed();
    int t;
    cin >> t;
    while(t --)
    {
        solve_test();
    }
    return 0;
}

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