Submission #1256141

#	Time	Username	Problem	Language	Result	Execution time	Memory
1256141		nguyenphong233	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	111 ms	9312 KiB

joi2019_ho_t1

// 23 - 12 - 23 

#include<bits/stdc++.h>

using namespace std;

#define read() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define day() time_t now = time(0);char* x = ctime(&now);cerr<<"Right Now Is : "<<x<<"\n"

#define int long long
#define ii pair<int,int>
#define X first
#define Y second 

const long long MAX = (int)3000 + 5;
const long long INF = (int)1e9;
const long long MOD = (int)1e9 + 7;

int n,m;
char a[MAX][MAX];
int O[MAX],I[MAX];
signed main(){
		
	read();
	cin >> n >> m;
	for(int i = 1;i <= n;i++){
		for(int j = 1;j <= m;j++){
			cin >> a[i][j];
		}
	}
	
	int res = 0;
	
	for(int i = n;i >= 1;i--){
		for(int j = m;j >= 1;j--){
			if(a[i][j] == 'O')O[i]++;
			else if(a[i][j] == 'I')I[j]++;
			else {
				res = (res + O[i] * I[j]);
			}
		}
	}
	
	cout << res;
}

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