Submission #546552

#	Time	Username	Problem	Language	Result	Execution time	Memory
546552		LucaDantas	Building Skyscrapers (CEOI19_skyscrapers)	C++17	54 / 100	363 ms	22612 KiB

skyscrapers

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

const int dx[] = {0, 0, 1, 1, 1, -1, -1, -1};
const int dy[] = {1, -1, 1, -1, 0, 1, -1, 0};

int main() {
    int n; scanf("%d", &n);
    int t; scanf("%d", &t);
    
    if(t == 2) return 0; // return to this subtask after coding t = 1

    vector<pair<int,int>> sk(n);
    for(auto& [x, y] : sk)
        scanf("%d %d", &x, &y);

    map<pair<int,int>, int> id;

    for(int i = 0; i < n; i++)
        id[sk[i]] = i+1;

    sort(sk.begin(), sk.end());

    set<pair<int,int>> mark;
    priority_queue<pair<int,int>> q;
    q.push(sk.back());
    mark.insert(sk.back());

    vector<int> ans;

    while(q.size()) {
        ans.push_back(id[q.top()]);
        auto [x, y] = q.top();
        q.pop();

        for(int k = 0; k < 8; k++)
            if(binary_search(sk.begin(), sk.end(), pair<int,int>(x+dx[k], y+dy[k])) && !mark.count(pair<int,int>(x+dx[k], y+dy[k])))
                q.push(pair<int,int>(x+dx[k], y+dy[k])), mark.insert(pair<int,int>(x+dx[k], y+dy[k]));
    }

    if(ans.size() == n) {
        puts("YES");
        for(int x : ans)
            printf("%d\n", x);
    } else {
        puts("NO");
    }
}

Compilation message (stderr)

skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:41:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   41 |     if(ans.size() == n) {
      |        ~~~~~~~~~~~^~~~
skyscrapers.cpp:8:17: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |     int n; scanf("%d", &n);
      |            ~~~~~^~~~~~~~~~
skyscrapers.cpp:9:17: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     int t; scanf("%d", &t);
      |            ~~~~~^~~~~~~~~~
skyscrapers.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

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