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Cod sursa(job #308373)
#include<fstream.h>
long long a[50001],u,k,z,n,i,c,y,s,yy,x,xx,max;
int main()
{
ifstream f("secv2.in");
ofstream g("secv2.out");
f>>n>>k;
s=0;
max=-200000000;
z=1;
for (i=1;i<=n;i++)
{
u=a[i];
f>>a[i];
if (s<0 && i-z+1>k){s=a[i];z=i-1;s-=u;}
else s=s+a[i];
if(max<s&&i-z+1>=k){max=s;if (a[z]<0)xx=z-1;else xx=z;yy=i;}
}
max=0;
for (i=xx;i<=yy;i++)
max+=a[i];
g<<xx<<' '<<yy<<' '<<max<<'\n';
g.close();
return 0;
}