Submission #156950

#	Time	Username	Problem	Language	Result	Execution time	Memory
156950		justkiddin	Skyscraper (JOI16_skyscraper)	C++14	0 / 100	2036 ms	376 KiB

skyscraper

//  𝒊𝒏𝒔𝒕𝒂𝒈𝒓𝒂𝒎: @___ᴊᴜꜱᴛᴋɪᴅᴅɪɴ
#include <bits/stdc++.h>
#define ll long long
#define Pii pair<int, int>
#define Piii pair<int, Pii>
#define _mp make_pair
#define _pb push_back
#define st first
#define nd second
#define whole(x) x.begin(), x.end()
#define Reset(x) memset(x, 0, sizeof(x))
#define PI acos(-1)
#define TASK ""
const int M = 1e5+8;
const int oo = 1e9+7;
using namespace std;

// mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());

int n, k, a[M], b[M];
long long Res = 0;
bool c[M];

int _calc(){
    long long Rest = 0;
    for(int i = 2; i <= n; i++){
        Rest += abs(a[b[i]] - a[b[i-1]]);
        if(Rest > k) return 0;
        // cout << a[b[i]] << ' ';
    }
    // cout << '\n';
    return 1;
}

void _try(int i){
    for(int j = 1; j <= n; j++){
        if(c[j] == true || ( abs(a[b[i]] - a[b[i-1]]) > k && i > 1)) 
            continue;
        b[i] = j;
        c[j] = true;
        if(i == n)
            Res = (Res + _calc())%oo;
        else
            _try(i+1);
        c[j] = false;
    }
}

int main(int argc, char const *argv[]){
    // freopen("test.txt", "r", stdin);
    // freopen(TASK".inp", "r", stdin);
    // freopen(TASK".out", "w", stdout);
    ios_base::sync_with_stdio(false);   cin.tie(0);
    cin >> n >> k;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        c[i] = false;
    }
    // memset(c, 0, sizeof(c));
    _try(1);
    cout << Res;
    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3: 0 / 80