This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int dx[8] = {0, 0, -1, 1, 1, 1, -1, -1};
int dy[8] = {1, -1, 0, 0, 1, -1, 1, -1};
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, t; cin >> n >> t;
vector<array<int, 2>> points;
set<array<int, 3>> points_set;
map<array<int, 2>, int> pt_to_idx;
for (int i = 0; i < n; i++){
int x, y; cin >> x >> y;
points.push_back({x, y});
points_set.insert({x, y, i});
pt_to_idx[{x, y}] = i;
}
set<array<int, 2>> visited;
vector<int> ans;
array<int, 3> tp = *points_set.begin();
visited.insert({tp[0], tp[1]});
ans.push_back(tp[2]);
points_set.erase(points_set.begin());
set<array<int, 3>> poss;
for (int d = 0; d < 8; d++){
if (pt_to_idx.count({tp[0]+dx[d], tp[1]+dy[d]})){
poss.insert({tp[0]+dx[d], tp[1]+dy[d], pt_to_idx[{tp[0]+dx[d], tp[1]+dy[d]}]});
visited.insert({tp[0]+dx[d], tp[1]+dy[d]});
}
}
while (!poss.empty()){
tp = *poss.begin();
poss.erase(poss.begin());
ans.push_back(tp[2]);
for (int d = 0; d < 8; d++){
array<int, 2> new_pt = {tp[0] + dx[d], tp[1] + dy[d]};
if (pt_to_idx.count(new_pt)){
if (!visited.count(new_pt)){
visited.insert(new_pt);
poss.insert({new_pt[0], new_pt[1], pt_to_idx[new_pt]});
}
}
}
}
if (ans.size() == n){
reverse(ans.begin(), ans.end());
cout << "YES\n";
for (int i = 0; i < n; i++){
cout << ans[i]+1 << "\n";
}
}
else{
cout << "NO\n";
}
}
Compilation message (stderr)
skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:51:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
51 | if (ans.size() == n){
| ~~~~~~~~~~~^~~~
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