Submission #754855

#	Time	Username	Problem	Language	Result	Execution time	Memory
754855		boris_mihov	Mountains (IOI17_mountains)	C++17	0 / 100	1 ms	212 KiB

mountains

#include "mountains.h"
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>

typedef long long llong;
const int MAXN = 2000 + 10;

int n;
int a[MAXN];
int rec(int l, int r)
{
    if (l > r)
    {
        return 0;
    }

    if (l + 2 > r)
    {
        return 1;
    }

    std::vector <int> max; 
    max.push_back(l - 1);
    
    int val = a[l];
    for (int i = l + 1 ; i <= r ; ++i)
    {
        val = std::max(val, a[i]);
    }

    for (int i = l ; i <= r ; ++i)
    {
        if (val == a[i])
        {
            max.push_back(i);
        }
    }

    int res = 0;
    max.push_back(r + 1);
    bool add = false;
    for (int i = 0 ; i < (int)max.size() - 1 ; ++i)
    {
        if (i - 1 > 0 && i + 1 < (int)max.size() - 1 && max[i - 1] + 1 == max[i] && max[i] + 1 == max[i + 1])
        {
            add = true;
        }

        res += rec(max[i] + 1, max[i + 1] - 1);
    }

    res += add;
    return res;
}

int maximum_deevs(std::vector <int> y) 
{
    n = y.size();
    for (int i = 1 ; i <= n ; ++i)
    {
        a[i] = y[i - 1];
    }

	return rec(1, n);
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30