Submission #391396

#	Time	Username	Problem	Language	Result	Execution time	Memory
391396		lukameladze	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	475 ms	155888 KiB

joi2019_ho_t1

# include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
using namespace std;
const int N=3005;
long long n,m,ans,sf1[N][N],sf[N][N];
char ch[N][N];
int main() {
     std::ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
     cin>>n>>m;
     for(int i=1; i<=n; i++) {
          for (int j=1; j<=m; j++) {
               cin>>ch[i][j];
          }
     }
     for (int i=1; i<=n; i++) {
          for (int j=m; j>=1; j--) {
               sf[i][j]=sf[i][j+1]+(ch[i][j]=='O');
          }
     }
     for (int j=1; j<=m; j++) {
          for (int i=n; i>=1; i--) {
               sf1[i][j]=sf1[i+1][j]+(ch[i][j]=='I');
          }
     }
     //cout<<sf[1][2]<<endl;
    // cout<<sf1[2][1];
     for (int i=1; i<=n; i++) {
          for (int j=1; j<=m; j++) {
               if (ch[i][j]!='J') continue;
               ans+=sf[i][j+1]*sf1[i+1][j];
          }
     }
     cout<<ans;
}

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