Submission #1166500

#	Time	Username	Problem	Language	Result	Execution time	Memory
1166500		chikien2009	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	88 ms	80712 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

inline void setup()
{
// #ifndef ONLINE_JUDGE
//     freopen("test.inp", "r", stdin);
//     freopen("test.out", "w", stdout);
// #endif
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int n, m, col[3000][3000], row[3000][3000];
string s[3000];
long long res = 0;

int main()
{
    setup();

    cin >> n >> m;
    for (int i = 0; i < n; ++i)
    {
        cin >> s[i];
        for (int j = m - 1; j >= 0; --j)
        {
            row[i][j] = (j == m - 1 ? 0 : row[i][j + 1]) + (s[i][j] == 'O');
        }
    }
    for (int i = n - 1; i >= 0; --i)
    {
        for (int j = 0; j < m; ++j)
        {
            col[i][j] = (i == n - 1 ? 0 : col[i + 1][j]) + (s[i][j] == 'I');
        }
    }
    for (int i = 0; i < n; ++i)
    {
        for (int j = 0; j < m; ++j)
        {
            if (s[i][j] == 'J')
            {
                res += row[i][j] * col[i][j];
            }
        }
    }
    cout << res;
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50