Submission #717547

#	Time	Username	Problem	Language	Result	Execution time	Memory
717547		vjudge1	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	570 ms	82064 KiB

joi2019_ho_t1

// Online C++ compiler to run C++ program online
#include <bits/stdc++.h>
using namespace std;
char a[3005][3005];
pair<int,int> x[3005][3005];

int main() {
    // Write C++ code here
    int n, m;
    long long k = 0ll;
    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; i--){
        for(int j = m; j; j--){
            x[i][j].first = x[i+1][j].first;
            x[i][j].second = x[i][j+1].second;
            if(a[i][j] == 'I')x[i][j].first++;
            if(a[i][j] == 'O')x[i][j].second++;
            if(a[i][j] == 'J')k += x[i][j].first * x[i][j].second;
        }
    }
    cout << k;

    return 0;
}

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