Submission #9848

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
9848	2014-10-01 15:07:32	effserv	Uniting (kriii2_U)	C++98	1 / 4	6 ms	416 KiB

U

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#include <cstdio>
#include <algorithm>
using namespace std;
typedef long long ll;
int main()
{
  int N;
  scanf("%d", &N);
  ll a;
  scanf("%lld", &a);
  ll A = (ll)a;
  ll C = 0;
  for (int i = 0; i < N - 1; i++)
  {
    scanf("%lld", &a);
    C += A*a;
    A += a;
  }
  printf("%lld\n", C);
  ll mod = 1000000007;
  ll bigmod = 1e13;
  ll S = N;
 
 
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Compilation message (stderr)

U.cpp: In function 'int main()':
U.cpp:12:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  scanf("%d", &N);
      |  ~~~~~^~~~~~~~~~
U.cpp:15:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  scanf("%lld", &a);
      |  ~~~~~^~~~~~~~~~~~
U.cpp:21:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |   scanf("%lld", &a);
      |   ~~~~~^~~~~~~~~~~~

• Subtask 1: 1 / 4