Submission #818757

#	Time	Username	Problem	Language	Result	Execution time	Memory
818757		vjudge1	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	617 ms	108016 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define ll long long 
#define pll pair<int, int>
#define pb push_back
#define fi first
#define se second
using namespace std;
const int MX=3005;
int h, w, prefr[MX][MX], prefc[MX][MX];
ll ans;
char g[MX][MX];

int main(){
	cin >> h >> w;
	vector<pll> start;
	for(int i=1; i<=h; i++){
		for(int j=1; j<=w; j++){
			cin >> g[i][j];
			if(g[i][j]=='J') start.pb({i, j});
			prefr[i][j]=prefr[i][j-1];
			prefc[j][i]=prefc[j][i-1];
			if(g[i][j]=='O') prefr[i][j]++;
			if(g[i][j]=='I') prefc[j][i]++;		
		}
	}
	for(auto i : start){
		int r=i.fi, c=i.se;
//		cout << r << " " << c << endl;
		int oo=(prefr[r][w]-prefr[r][c]);
		int ii=(prefc[c][h]-prefc[c][r]);
//		cout << "nilai " << ii << " " << oo << endl;
		ans+=ii*oo;
	}
	cout << ans << endl;
	return 0;
}

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