Submission #992738

#	Time	Username	Problem	Language	Result	Execution time	Memory
992738		danikoynov	Red-blue table (IZhO19_stones)	C++14	100 / 100	24 ms	2380 KiB

stones

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

const int maxn = 1e3 + 10;

int n, m;
int d[maxn];
bool check(int r, int c, int t)
{
    int con = min((m - 1) / 2, c);
    int nec = t * c;
    ///cout << r * con << " : " << nec << endl;
    return r * con >= nec;
}

char table[maxn][maxn];

void solve()
{
    cin >> n >> m;
    //cout << check(3, 6, 1) << endl;
    //exit(0);
    int max_res = 0, mrow = -1, mcol = -1;
    for (int x = 0; x <= n; x ++)
    {
        int nec = n / 2 + 1 - (n - x);
        nec = max(nec, 0);

        int lf = 0, rf = m + 1;
        while(lf + 1 < rf)
        {
            int mf = (lf + rf) / 2;
            if (check(x, mf, nec))
                lf = mf;
            else
                rf = mf;
        }

        if (x + lf > max_res)
        {
            max_res = x + lf;
            mrow = x;
            mcol = lf;
        }
    }

    cout << max_res << endl;
    ///cout << mrow << " " << mcol << endl;
    for (int i = 1; i <= n; i ++)
        for (int j = 1; j <= m; j ++)
        table[i][j] = '+';

    for (int i = mrow + 1; i <= n; i ++)
        for (int j = 1; j <= mcol; j ++)
        table[i][j] = '-';

    int pv = 1;
    int con = min((m - 1) / 2, mcol);
    for (int i = 1; i <= mrow; i ++)
    {
        for (int step = 1; step <= con; step ++)
        {
            if (pv > mcol)
                pv = 1;
            table[i][pv] = '-';
            pv ++;
        }
    }

    for (int i = 1; i <= n; i ++, cout << endl)
        for (int j = 1; j <= m; j ++)
        cout << table[i][j];

}

int main()
{
    ///speed();
    int t;
    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