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Cod sursa(job #943939)
#include<cstdio>
#define NM 500100
using namespace std;
int A[NM],n,k,i,front,back,D[NM],ma,st,dr;
int main()
{
freopen("secventa.in","r",stdin);
freopen("secventa.out","w",stdout);
ma=-900000;
scanf("%d%d",&n,&k);
for(i=1;i<=n;++i)
scanf("%d",&A[i]);
front=1;
back=0;
for(i=1;i<=n;++i)
{
while(front<=back&&A[i]<=A[D[back]]) D[back]=0,back--;
D[++back]=i;
if(D[front]==i-k) front++;
if(i>=k&&A[D[front]]>ma)
ma=A[D[front]],st=i-k+1,dr=i;
}
printf("%d %d %d",st,dr,ma);
return 0;
}