Submission #1494146

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

#define FOR(i,l,r) for(int i = int(l);i < int(r);i++)
template<typename T> bool chmax(T& a,const T& b){ return a < b ? (a = b,true) : false; }
template<typename T> bool chmin(T& a,const T& b){ return b < a ? (a = b,true) : false; }
typedef long long ll;

ll N,T;
vector<ll> A,Q,C;
const ll MOD = 1e9 + 7;

ll mod_pow(ll x,ll y = MOD - 2)
{
	ll res = 1;
	while(y){
		if(y & 1) (res *= x) %= MOD;
		(x *= x) %= MOD;
		y >>= 1;
	}
	return res;
}

int main()
{
	scanf("%lld",&N);
	A.assign(N + 1,0);
	FOR(i,0,N + 1){
		scanf("%lld",&A [i]);
	}
	scanf("%lld",&T);
	if(T <= N){
		printf("%lld\n",A [T]);
		return 0;
	}

	Q.assign(N + 1,1);
	FOR(i,1,N + 1){
		(Q [0] *= MOD - i) %= MOD;
	}
	FOR(i,1,N + 1){
		Q [i] = Q [i - 1] * mod_pow(i - 1 - N + MOD) % MOD * i % MOD;
	}

	C.assign(N + 1,0);
	FOR(i,0,N + 1){
		C [i] = A [i] * mod_pow(Q [i]) % MOD;
	}

	ll x = 1;
	FOR(i,0,N + 1){
		(x *= T - i) %= MOD;
	}

	ll ans = 0;
	FOR(i,0,N + 1){
		(ans += C [i] * x % MOD * mod_pow(T - i)) %= MOD;
	}
	printf("%lld\n",ans);

	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:26:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld",&N);
                  ^
./Main.cpp:29:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld",&A [i]);
                       ^
./Main.cpp:31:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld",&T);
                  ^

Judge Result