// Call my Name and Save me from The Dark #include <bits/stdc++.h> using namespace std; typedef long long int ll; typedef pair<int, int> pii; #define SZ(x) (int) x.size() #define F first #define S second const int N = 3e3 + 10, MOD = 1e9 + 7; char A[N][N]; int n, m, I[N][N], O[N][N]; int main() { 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 = m; j >= 1; j--) O[i][j] = O[i][j + 1] + (A[i][j] == 'O'); } for (int j = 1; j <= m; j++) { for (int i = n; i >= 1; i--) { I[i][j] = I[i + 1][j] + (A[i][j] == 'I'); } } ll ret = 0; for (int i = 1; i <= n; i++) for (int j = 1; j <= m; j++) if (A[i][j] == 'J') ret += 1ll * O[i][j] * I[i][j]; printf("%lld\n", ret); return 0; }

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |         scanf("%s", A[i] + 1);
      |         ~~~~~^~~~~~~~~~~~~~~~