Submission #127605

#	Time	Username	Problem	Language	Result	Execution time	Memory
127605		IOrtroiii	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	332 ms	88904 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

const int N = 3030;

char a[N][N];
int row[N][N];
int col[N][N];

int main() {
   int n, m;
   scanf("%d %d", &n, &m);
   for (int i = 1; i <= n; ++i) {
      scanf("%s", a[i] + 1);
   }
   for (int i = 1; i <= n; ++i) {
      for (int j = 1; j <= m; ++j) {
         if (a[i][j] == 'O') {
            ++row[i][j];
         } else if (a[i][j] == 'I') {
            ++col[i][j];
         }
      }
   }
   for (int i = 1; i <= n; ++i) {
      for (int j = m; j > 0; --j) {
         row[i][j] += row[i][j + 1];
      }
   }
   for (int j = 1; j <= m; ++j) {
      for (int i = n; i > 0; --i) {
         col[i][j] += col[i + 1][j];
      }
   }
   long long ans = 0;
   for (int i = 1; i <= n; ++i) {
      for (int j = 1; j <= m; ++j) {
         if (a[i][j] == 'J') {
            ans += row[i][j] * col[i][j];
         }
      }
   }
   printf("%lld\n", ans);
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:13:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d", &n, &m);
    ~~~~~^~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:15:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%s", a[i] + 1);
       ~~~~~^~~~~~~~~~~~~~~~

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