제출 #718307

#제출 시각아이디문제언어결과실행 시간메모리
718307Yell0Bitaro the Brave (JOI19_ho_t1)C++17
100 / 100
141 ms158888 KiB
#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;
}

컴파일 시 표준 에러 (stderr) 메시지

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;
      |                              ~~~~~^~
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