Submission #718307

#	Time	Username	Problem	Language	Result	Execution time	Memory
718307		Yell0	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	141 ms	158888 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
 
using namespace std;
typedef long long ll;
const int MN=3002;
int H,W;
ll sfr[MN][MN],sfc[MN][MN];
char gr[MN][MN];
 
int main() {
  ios::sync_with_stdio(0);cin.tie(0);
  cin>>H>>W;
  for(int i=1;i<=H;++i) cin>>gr[i]+1;
  for(int i=1;i<=H;++i)
    for(int j=W;j>0;--j) sfr[i][j]=sfr[i][j+1]+(gr[i][j]=='O');
  for(int i=H;i>0;--i)
    for(int j=1;j<=W;++j) sfc[i][j]=sfc[i+1][j]+(gr[i][j]=='I');
  ll ans=0;
  for(int i=1;i<=H;++i)
    for(int j=1;j<=W;++j)
      if(gr[i][j]=='J') ans+=sfr[i][j]*sfc[i][j];
  cout<<ans<<'\n';
  return 0;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:13:35: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   13 |   for(int i=1;i<=H;++i) cin>>gr[i]+1;
      |                              ~~~~~^~

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