This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int maxn = 3e3+10;
char mat[maxn][maxn];
long long prefi[maxn][maxn], prefo[maxn][maxn];
int main(){
int h, w;
cin >> h >> w;
for(int i=1; i<=h; i++){
for(int j=1; j<=w; j++){
cin >> mat[i][j];
}
}
for(int i=1; i<=h; i++){
for(int j=w; j>=1; j--){
if(mat[i][j]=='O')prefo[i][j]=1;
prefo[i][j]+=prefo[i][j+1];
}
}
for(int i=h; i>=1; i--){
for(int j=1; j<=w; j++){
if(mat[i][j]=='I')prefi[i][j]=1;
prefi[i][j]+=prefi[i+1][j];
}
}
long long ans=0;
for(int i=1; i<=h; i++){
for(int j=1; j<=w; j++){
if(mat[i][j]=='J'){
ans+=prefi[i][j]*prefo[i][j];
}
}
}
cout << ans << endl;
}
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