Submission #1023591

#	Time	Username	Problem	Language	Result	Execution time	Memory
1023591		vjudge1	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	141 ms	18164 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define ll long long
#define pll pair<ll, ll>
#define fi first
#define se second

using namespace std;

const int N = 3005;

int n, m;
char a[N][N];
ll ans = 0, dem[N];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= m; j++)
            cin >> a[i][j];
    for(int i = n; i >= 1; i--)
    {
        ll cnt = 0;
        for(int j = m; j >= 1; j--)
        {
            if(a[i][j] == 'I')
                dem[j]++;
            if(a[i][j] == 'O')
                cnt++;
            if(a[i][j] == 'J')
                ans += cnt * dem[j];
        }
    }
    cout << ans;
    return 0;
}

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