Cod sursa(job #756295)
Utilizator | Christescu Matei matei_c | Data | 9 iunie 2012 14:18:28 |
---|---|---|---|
Problema | Divk | Scor | 90 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.48 kb |
#include<cstdio>
const int MAX_N = 500011 ;
int n,k,a,b ;
int v[MAX_N],w[MAX_N] ;
int sol;
int main()
{
freopen("divk.in","r",stdin);
freopen("divk.out","w",stdout);
scanf("%d%d%d%d",&n,&k,&a,&b);
for(long long i=1;i<=n;++i)
{
scanf("%d",&v[i]);
v[i] = ( v[i] + v[i-1] ) % k ;
}
for(long long i=a;i<=n;++i)
{
++ w[ v[i-a] ] ;
if(i > b)
-- w[ v[i-b-1] ] ;
sol += w[ v[i] ] ;
}
printf("%d\n",sol);
return 0;
}