Submission #2872009

---

Source Code Expand

#include <bits/stdc++.h>
using namespace std;
const int N = 100010;
int n,a[N],las;
int main() {
  scanf("%d",&n);
  for (int i = 1 ; i <= n ; ++ i)
    scanf("%d",&a[i]);
  sort(a+1,a+n+1);
  for (int i = n ; i > 1 ; -- i) {
    if (a[i] == a[i-1]) {
      if (!las) {
	las = a[i];
	-- i;
      } else return 0 * printf("%d\n",las * a[i]);
    }
  }
  puts("0");
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:6:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&n);
                 ^
./Main.cpp:8:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&a[i]);
                      ^

Judge Result