Submission #1493976

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second
template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> pip;
typedef pair<pll, pll> P;
const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS = 1e-9;
const bool debug = 0;
//---------------------------------//

ll mod_pow(ll x, ll n, ll mod) {
	if (n == 0) return 1;
	ll res = mod_pow(x * x % mod, n / 2, mod);
	if (n & 1) res = res * x % mod;
	return res;
}

ll mulm(ll a, ll b) { return a * b % MOD; }
ll divm(ll a, ll b) { return a * mod_pow(b, MOD - 2, MOD) % MOD; }
ll subm(ll a, ll b) { return (a - b + MOD) % MOD; }
ll addm(ll a, ll b) { return (a + b) % MOD; }

int N, T;
int y[112345];

int main() {
	cin >> N;
	REP(i, N + 1) scanf("%d", y + i);
	cin >> T;
	
	if (N >= T) {
		cout << y[T] << endl;
		return 0;
	}
	
	ll sp = 1;
	REP(i, N + 1) sp = mulm(sp, subm(T, i));
	
	ll p = 1;
	FOR(i, 1, N + 1) p = mulm(p, subm(0, i));
	
	ll ans = 0;
	REP(i, N + 1) {
		ll now = mulm(y[i], divm(sp, subm(T, i)));
		if (i > 0) {
			p = divm(p, (-(N - i + 1) + MOD) % MOD);
			p = mulm(p, i);
		}
		
		ans = addm(ans, divm(now, p));
	}
	
	cout << ans << endl;
	
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:38:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  REP(i, N + 1) scanf("%d", y + i);
                                  ^

Judge Result