Submission #720966

#	Time	Username	Problem	Language	Result	Execution time	Memory
720966		pcc	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	639 ms	10624 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;

const int mxn = 3030;
string arr[mxn];
#define ll long long
map<pair<ll,ll>,ll> J;
map<ll,ll> O,I;

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int n,m;
	cin>>n>>m;
	for(int i = 0;i<n;i++)cin>>arr[i];
	ll ans = 0;
	for(int i = n-1;i>=0;i--){
		for(int j = m-1;j>=0;j--){
			if(arr[i][j] == 'J')ans += O[i]*I[j];
			else if(arr[i][j] == 'O')O[i]++;
			else I[j]++;
		}
	}
	cout<<ans;
}

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