Submission #564578

#	Time	Username	Problem	Language	Result	Execution time	Memory
564578		RealSnake	Building Skyscrapers (CEOI19_skyscrapers)	C++14	0 / 100	12 ms	1464 KiB

skyscrapers

#include "bits/stdc++.h"
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

#define ll long long
#define mod 1000000007

ofstream fout(".out");
ifstream fin(".in");

int n, t;
bool vis[11][11], viss[11][11];
int xi[8] = {0, 0, 1, -1, 1, 1, -1, -1};
int yi[8] = {-1, 1, 0, 0, -1, 1, -1, 1};

bool check(int x, int y) {
    return x >= 0 && x < n && y >= 0 && y < n;
}

bool check2(int x, int y) {
    vis[x][y] = 1;
    bool b = 0;
    for(int i = 0; i < 4; i++) {
        int xx = x + xi[i];
        int yy = y + yi[i];
        if(!check(xx, yy))
            b = 1;
        else if(!vis[xx][yy])
            b |= check2(xx, yy);
        if(b)
            return 1;
    }
    return 0;
}

signed main() {

    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    cin >> n >> t;
    vector<pair<int, int>> v;
    for(int i = 0; i < n; i++) {
        int x, y;
        cin >> x >> y;
        v.push_back({x, y});
    }
    if(n <= 10) {
        vector<int> vec;
        for(int i = 0; i < n; i++)
            vec.push_back(i);
        vector<int> ans;
        do {
            for(int i = 0; i < n; i++) {
                for(int j = 0; j < n; j++)
                    vis[i][j] = viss[i][j] = 0;
            }
            bool yes = 1;
            for(int i = 0; i < n; i++) {
                int j = vec[i];
                int x = v[j].first, y = v[j].second;
                viss[x][y] = 1;
                for(int j = 0; j < 8; j++) {
                    if(!i)
                        break;
                    int xx = x + xi[j];
                    int yy = y + yi[j];
                    if(check(xx, yy) && viss[xx][yy])
                        break;
                    if(j == 7) {
                        yes = 0;
                        break;
                    }
                }
                if(!yes || !check2(x, y)) {
                    yes = 0;
                    break;
                }
            }
            if(yes) {
                if(!ans.size())
                    ans = vec;
                else if(vec > ans)
                    ans = vec;
            }
        } while(next_permutation(vec.begin(), vec.end()));
        if(ans.size()) {
            cout << "YES\n";
            reverse(ans.begin(), ans.end());
            for(int i : ans)
                cout << i + 1 << "\n";
        }
        else
            cout << "NO\n";
    }

    return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 14
• Subtask 3: 0 / 12
• Subtask 4: 0 / 17
• Subtask 5: 0 / 20
• Subtask 6: 0 / 10
• Subtask 7: 0 / 19