Submission #1013093

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013093		aufan	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	119 ms	18228 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second

using namespace std;

int32_t main()
{
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        
        int n, m;
        cin >> n >> m;

        vector<vector<char>> c(n + 1, vector<char>(m + 1));
        for (int i = 1; i <= n; i++) {
                for (int j = 1; j <= m; j++) {
                        cin >> c[i][j];
                }
        }

        int ans = 0;
        vector<int> ci(m + 1);
        for (int i = n; i >= 1; i--) {
                int co = 0;
                for (int j = m; j >= 1; j--) {
                        if (c[i][j] == 'J') {
                                ans += ci[j] * co;
                        }

                        if (c[i][j] == 'O') {
                                co += 1;
                        }

                        if (c[i][j] == 'I') {
                                ci[j] += 1;
                        }
                }
        }

        cout << ans << '\n';
        
        return 0;
}

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