Submission #107156

#	Time	Username	Problem	Language	Result	Execution time	Memory
107156		abil	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	514 ms	159316 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

#define mk make_pair
#define sc second
#define fr first
#define pb emplace_back
#define all(s) s.begin(), s.end()
#define sz(s) ( (int)s.size() )
#define int long long

using namespace std;

const int inf = (int)1e9 + 7  ;
const long long mod = 1e9 + 7;
const int N = (int)3007;

int n, m;
char ch[N][N],c;
int jo[N][N], joop[N][N];
main(){
      cin >> n >> m;
      for(int i = 1;i <= n; i++){
            int cnt = 0;
            scanf(" %s", ch[i]);
            for(int j = 0;j < m; j++){
                  cnt += (ch[i][j] == 'O');
            }
            for(int j = 0;j < m; j++){
                  if(ch[i][j] == 'J'){
                        jo[i][j] = cnt;
                  }
                  cnt -= (ch[i][j] == 'O');
            }
      }
      for(int j = 0;j < m; j++){
            for(int i = 1;i <= n; i++){
                  joop[i][j] = joop[i - 1][j] + jo[i][j];
            }
      }
      int ans = 0;
      for(int i = 1;i <= n; i++){
            for(int j = 0;j < m; j++){
                  if(ch[i][j] == 'I'){
                        ans += joop[i][j];
                  }
            }
      }
      cout << ans;

}

Compilation message (stderr)

joi2019_ho_t1.cpp:20:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:24:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf(" %s", ch[i]);
             ~~~~~^~~~~~~~~~~~~~

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