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Cod sursa(job #97071)
#include<stdio.h>
int n, k, v[500005], i, first, last, max, p1, p2;
struct deque{
int v, i;
};
deque q[500005];
int main()
{
freopen("secventa.in", "rt", stdin);
freopen("secventa.out", "wt", stdout);
scanf("%d%d", &n, &k);
for (i=1; i<=n; i++)
scanf("%d", &v[i]);
q[1].v = v[1];
q[1].i = 1;
first = 1;
last = 1;
max = -30001;
for (i=2; i<=n; i++){
while (first <= last && i-q[first].i >= k)
first ++;
while (first <= last && v[i] <= q[last].v)
last --;
q[++last].v = v[i];
q[last].i = i;
if (q[first].v > max && i-k+1 > 0){
max = q[first].v;
p1 = i-k+1;
p2 = i;
}
}
printf("%d %d %d\n", p1, p2, max);
fclose(stdin);
fclose(stdout);
return 0;
}