Cod sursa(job #338550)

Utilizator cotofanaCotofana Cristian cotofana Data 5 august 2009 23:35:29
Problema Grigo Scor 10
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.33 kb
Raporteaza aceasta sursa 
#include <stdio.h>
long long N, M, v[100001];
int main() {
	long long i, sol=1, x;
	freopen("grigo.in", "r", stdin);
	freopen("grigo.out", "w", stdout);
	scanf("%lld %lld\n", &N, &M);
	for (i=1; i<=M; ++i) {
		scanf("%lld ", &x);
		v[x]=1;
	}
	for (i=3; i<=N; ++i) sol*=(v[i]?1:i-1);
	printf("%lld\n", sol);
	return 0;
}