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Cod sursa(job #592766)
#include <stdio.h>
#include <deque>
using namespace std;
FILE *in = fopen("secventa.in","r"), *out = fopen("secventa.out","w");
const int maxn = 500001;
int n, k;
int a[maxn];
void citire()
{
fscanf(in, "%d %d", &n, &k);
for (int i = 1; i <= n; ++i)
fscanf(in, "%d", &a[i]);
}
void brut()
{
int inc, sf, maxim = -1000000000;
for (int i = 1; i <= n - k + 1; ++i)
{
int min = a[i];
for (int j = i; j <= i + k - 1; ++j)
if (a[j] < min)
min = a[j];
if (min > maxim)
{
maxim = min;
inc = i;
sf = i + k - 1;
}
}
fprintf(out, "%d %d %d", inc, sf, maxim);
}
void optim()
{
int maxim = -1000000000, inc, sf;
deque<int> d;
for (int i = 1; i < k; ++i)
{
while (!d.empty() && a[ d.back() ] > a[i])
d.pop_back();
if (!d.empty() && d.front() <= i - k)
d.pop_front();
d.push_back(i);
}
for (int i = k; i <= n; ++i)
{
while (!d.empty() && a[ d.back() ] > a[i])
d.pop_back();
if (!d.empty() && d.front() <= i - k)
d.pop_front();
d.push_back(i);
if (a[ d.front() ] > maxim)
{
maxim = a[ d.front() ];
inc = i - k + 1;
sf = i;
}
}
fprintf(out, "%d %d %d", inc, sf, maxim);
}
int main()
{
citire();
//brut();
optim();
return 0;
}