Pagini recente » Borderou de evaluare (job #382015) | Cod sursa (job #592773) | Borderou de evaluare (job #291261) | Cod sursa (job #592762) | Cod sursa (job #592763)
Cod sursa(job #592763)
#include <stdio.h>
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);
}
int deque[maxn], p, u;
void optim()
{
p = 1;
u = 0;
int maxim = -1000000000, inc, sf;
for (int i = 1; i < k; ++i)
{
while (p <= u && a[ deque[u] ] > a[i])
--u;
if (p <= u && deque[p] <= i - k)
++p;
deque[++u] = i;
}
for (int i = k; i <= n; ++i)
{
while (p <= u && a[ deque[u] ] > a[i])
--u;
if (p <= u && deque[p] <= i - k)
++p;
deque[++u] = i;
if (a[ deque[p] ] > maxim)
{
maxim = a[ deque[p] ];
inc = i - k + 1;
sf = i;
}
}
fprintf(out, "%d %d %d", inc, sf, maxim);
}
int main()
{
citire();
//brut();
optim();
return 0;
}