Submission #363964

#	Time	Username	Problem	Language	Result	Execution time	Memory
363964		MaisyDoge13	A Huge Tower (CEOI10_tower)	C++17	30 / 100	1097 ms	262148 KiB

tower

#include <iostream>
#include <cstdio>
#include <vector>
#include <utility>
#include <cmath>
#include <algorithm>
#include <array>
#include <set>
#include <map>
#include <climits>
using namespace std;

#define input "tower.in"
#define output "tower.out"
#define int long long
#define MOD (int)(1e9+9)
int n, k;
vector<int> a_orig;
vector<int> a;
int ans=1;

bool within(int n1, int n2) {
    return (n1+k>=n2);
}
int recurs(vector<bool> vis, int last) {
    if (find(vis.begin(), vis.end(), 0) == vis.end()) return 1;
    //for (int x: a) cout << x << ' ';
    //cout << endl;
    //for (bool b: vis) cout << b << ' ';
    //cout << endl;
    int curr_sum=0;
    for (int i=0;i<a.size();i++) {
        if (!within(last, a[i])) {
            //cout << last << " not within " << a[i] << endl;
            return curr_sum;
        }
        if (!vis[i]) {
            vis[i] = true;
            curr_sum += recurs(vis, a[i]);
            vis[i] = false;
        }
    }
    return curr_sum;
}
signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    //freopen(input, "r", stdin);
    //freopen(output, "w", stdout);
    cin >> n >> k;
    a_orig.reserve(n);
    a.reserve(n);
    int x;
    for (int i=0;i<n;i++) {
        cin >> x;
        a_orig.push_back(x);
    }
    sort(a_orig.begin(), a_orig.end());
    a.push_back(a_orig[0]);
    for (int i=1;i<n;i++) {
        if (!within(a_orig[i-1], a_orig[i])) {
            ans *= recurs(vector<bool>(a.size(), 0), INT_MAX);
            a.clear();
        }
        a.push_back(a_orig[i]);
    }
    ans *= recurs(vector<bool>(a.size(), 0), INT_MAX);
    cout << ans % MOD;
}

Compilation message (stderr)

tower.cpp: In function 'long long int recurs(std::vector<bool>, long long int)':
tower.cpp:32:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for (int i=0;i<a.size();i++) {
      |                  ~^~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
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