Submission #99164

#	Time	Username	Problem	Language	Result	Execution time	Memory
99164		dongwon0427	Bitaro the Brave (JOI19_ho_t1)	C++11	100 / 100	271 ms	86864 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;


int n,m;
char A[3005][3005];
pii B[3005][3005];
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=1;i<=n;i++) {
        for(int j=m;j>=1;j--) {
            B[i][j].first = B[i][j+1].first + (A[i][j] == 'O');
        }
    }
    for(int i=n;i>=1;i--) {
        for(int j=1;j<=m;j++) {
            B[i][j].second = B[i+1][j].second + (A[i][j] == 'I');
        }
    }
    ll ans = 0;
    for(int i=1;i<=n;i++) {
        for(int j=1;j<=m;j++) {
            if(A[i][j] == 'J') {
                ans += B[i][j].first * B[i][j].second;
            }
        }
    }
    cout<<ans;
    return 0;
}

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