Cod sursa(job #1371718)

Utilizator depevladVlad Dumitru-Popescu depevlad Data 4 martie 2015 00:31:38
Problema Secventa Scor 80
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.24 kb
#include <cstdio>
#include <stack>
#include <algorithm>

using namespace std;

#define inFile "secventa.in"
#define outFile "secventa.out"
#define MAX_N 500001
#define INF 1<<30

stack<int> s;
int a[MAX_N], left[MAX_N], right[MAX_N];

int main() {
    freopen(inFile, "r", stdin);
    freopen(outFile, "w", stdout);
    
    int n, k, i;
    
    scanf("%d %d", &n, &k);
    for(i = 1; i <= n; i++)
        scanf("%d", &a[i]);
        
    for(i = 1; i <= n; i++) {
        while(!s.empty() && a[i] < a[s.top()])
            right[s.top()] = i, s.pop();
        s.push(i);
    }
    while(!s.empty())
        right[s.top()] = n+1, s.pop();
    
    for(i = n; i; i--) {
        while(!s.empty() && a[i] < a[s.top()])
            left[s.top()] = i, s.pop();
        s.push(i);
    }
    while(!s.empty())
        left[s.top()] = 0, s.pop();
    
    int base_max = -INF, i_max = -1, j_max = -1;
    for(i = 1; i <= n; i++) {
        if(right[i] - left[i] - 1 >= k) {
            if(a[i] > base_max) {
                base_max = a[i];
                i_max = left[i]+1;
                j_max = max(i, left[i]+k);
            }
        }
    }
    
    printf("%d %d %d\n", i_max, j_max, base_max);
    
    return 0;
}