Submission #1371010

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll mod = 1e9+7;

ll n, m, a[100005];

ll calc (ll X) {
	ll R = 0;
	for(ll i=0;i<X;i++) {
		scanf("%lld",&a[i]);
	}
	for(ll i=1;i<X;i++) {
		R += (a[i] - a[i-1]) * i % mod * (X-i) % mod;
		R %= mod;
	}
	return R;
}

int main()
{
	scanf("%lld%lld",&n,&m);
	ll A = calc(n);
	ll B = calc(m);
	printf("%lld\n",A*B%mod);
}

Submission Info

Compile Error

./Main.cpp: In function ‘ll calc(ll)’:
./Main.cpp:11:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld",&a[i]);
                      ^
./Main.cpp: In function ‘int main()’:
./Main.cpp:22:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld",&n,&m);
                         ^

Judge Result