Submission #101892

#TimeUsernameProblemLanguageResultExecution timeMemory
101892PajarajaBitaro the Brave (JOI19_ho_t1)C++17
100 / 100
509 ms154232 KiB
#include <bits/stdc++.h>
#define MAXN 3007
using namespace std;
char c[MAXN][MAXN];
long long l[MAXN][MAXN],d[MAXN][MAXN],sol;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int h,w; cin>>h>>w;
	for(int i=0;i<h;i++) for(int j=0;j<w;j++) cin>>c[i][j];
	for(int i=h-1;i>=0;i--) for(int j=0;j<w;j++) l[i][j]=l[i+1][j]+(c[i][j]=='I'?1:0);
	for(int j=w-1;j>=0;j--) for(int i=0;i<h;i++) d[i][j]=d[i][j+1]+(c[i][j]=='O'?1:0);
	for(int i=0;i<h;i++) for(int j=0;j<w;j++) if(c[i][j]=='J') sol+=l[i][j]*d[i][j];
	cout<<sol;
}
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