#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define int long long
typedef long long ll;
const int M = 2e6 + 5, MOD = 1e9+7;
struct point {int x, y, i;};
vector<int> node[M];
int vis[M], cnt;
vector<int> ans;
void dfs(int s) {
vis[s] = true;
ans.push_back(s);
cnt++;
int mx = 0, tmp = 0;
for (int i:node[s]) mx += vis[i];
if (mx >= 2) {
swap(ans[ans.size()-1], ans[ans.size()-2]);
tmp = ans.back();
ans.pop_back();
}
for (int i:node[s]) {
if (!vis[i]) dfs(i);
}
if (tmp) ans.push_back(tmp);
}
signed main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
srand(time(0));
int n, t;
cin >> n >> t;
vector<point> v(n);
for (auto&i:v) cin >> i.x >> i.y;
int ind = 1; for (auto&i:v) i.i = ind++;
vector<point> p;
sort(v.begin(), v.end(), [](point a, point b){if (a.y == b.y) return a.x < b.x; return a.y < b.y;});
for (int i = 0; i < n; i++) {
while (i < n && (!i || v[i].y == v[i-1].y)) {
p.push_back(v[i++]);
}
for (int j = 1; j < p.size(); j++) {
if (p[j-1].x+1 == p[j].x) {
node[p[j].i].push_back(p[j-1].i);
node[p[j-1].i].push_back(p[j].i);
}
}
p.clear();
p.push_back(v[i]);
}
p.clear();
sort(v.begin(), v.end(), [](point a, point b){if (a.x == b.x) return a.y < b.y; return a.x < b.x;});
for (int i = 0; i < n; i++) {
while (i < n && (!i || v[i].x == v[i-1].x)) {
p.push_back(v[i++]);
}
for (int j = 1; j < p.size(); j++) {
if (p[j-1].y+1 == p[j].y) {
node[p[j].i].push_back(p[j-1].i);
node[p[j-1].i].push_back(p[j].i);
}
}
p.clear();
p.push_back(v[i]);
}
p.clear();
sort(v.begin(), v.end(), [](point a, point b){if ((a.x+a.y) == (b.x+b.y)) return a.x < b.x; return a.x+a.y < b.x+b.y;});
for (int i = 0; i < n; i++) {
while (i < n && (!i || (v[i].x+v[i].y) == (v[i-1].x+v[i-1].y))) {
p.push_back(v[i++]);
}
for (int j = 1; j < p.size(); j++) {
if (p[j-1].x+1 == p[j].x) {
node[p[j].i].push_back(p[j-1].i);
node[p[j-1].i].push_back(p[j].i);
}
}
p.clear();
p.push_back(v[i]);
}
p.clear();
sort(v.begin(), v.end(), [](point a, point b){if ((a.x-a.y) == (b.x-b.y)) return a.x < b.x; return a.x-a.y < b.x-b.y;});
for (int i = 0; i < n; i++) {
while (i < n && (!i || (v[i].x-v[i].y) == (v[i-1].x-v[i-1].y))) {
p.push_back(v[i++]);
}
for (int j = 1; j < p.size(); j++) {
if (p[j-1].x+1 == p[j].x) {
node[p[j].i].push_back(p[j-1].i);
node[p[j-1].i].push_back(p[j].i);
}
}
p.clear();
p.push_back(v[i]);
}
dfs(1);
if (cnt >= n) {
cout << "YES" << endl;
for (int i:ans) cout << i << endl;
} else cout << "NO" << endl;
return 0;
}
/*
3 2
0 0
0 1
0 2
*/
Compilation message
skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:49:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
49 | for (int j = 1; j < p.size(); j++) {
| ~~^~~~~~~~~~
skyscrapers.cpp:67:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
67 | for (int j = 1; j < p.size(); j++) {
| ~~^~~~~~~~~~
skyscrapers.cpp:85:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
85 | for (int j = 1; j < p.size(); j++) {
| ~~^~~~~~~~~~
skyscrapers.cpp:103:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
103 | for (int j = 1; j < p.size(); j++) {
| ~~^~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
47176 KB |
ans=YES N=1 |
| 2 |
Correct |
24 ms |
47184 KB |
ans=YES N=4 |
| 3 |
Correct |
22 ms |
47216 KB |
ans=NO N=4 |
| 4 |
Correct |
27 ms |
47184 KB |
ans=YES N=5 |
| 5 |
Incorrect |
25 ms |
47252 KB |
Full cells must be connected |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
47176 KB |
ans=YES N=1 |
| 2 |
Correct |
24 ms |
47184 KB |
ans=YES N=4 |
| 3 |
Correct |
22 ms |
47216 KB |
ans=NO N=4 |
| 4 |
Correct |
27 ms |
47184 KB |
ans=YES N=5 |
| 5 |
Incorrect |
25 ms |
47252 KB |
Full cells must be connected |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
47176 KB |
ans=YES N=1 |
| 2 |
Correct |
24 ms |
47184 KB |
ans=YES N=4 |
| 3 |
Correct |
22 ms |
47216 KB |
ans=NO N=4 |
| 4 |
Correct |
27 ms |
47184 KB |
ans=YES N=5 |
| 5 |
Incorrect |
25 ms |
47252 KB |
Full cells must be connected |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
23 ms |
47316 KB |
ans=NO N=1934 |
| 2 |
Correct |
24 ms |
47456 KB |
ans=NO N=1965 |
| 3 |
Incorrect |
25 ms |
47600 KB |
Full cells must be connected |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
47176 KB |
ans=YES N=1 |
| 2 |
Correct |
24 ms |
47184 KB |
ans=YES N=4 |
| 3 |
Correct |
22 ms |
47216 KB |
ans=NO N=4 |
| 4 |
Correct |
27 ms |
47184 KB |
ans=YES N=5 |
| 5 |
Incorrect |
25 ms |
47252 KB |
Full cells must be connected |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
95 ms |
57512 KB |
ans=NO N=66151 |
| 2 |
Correct |
58 ms |
49536 KB |
ans=NO N=64333 |
| 3 |
Incorrect |
116 ms |
57828 KB |
Full cells must be connected |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
23 ms |
47316 KB |
ans=NO N=1934 |
| 2 |
Correct |
24 ms |
47456 KB |
ans=NO N=1965 |
| 3 |
Incorrect |
25 ms |
47600 KB |
Full cells must be connected |
| 4 |
Halted |
0 ms |
0 KB |
- |
