This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD1 (1000000000+7)
#define MOD (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;
int n, t, b[8][2] = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}, {1, 1}, {1, -1}, {-1, 1}, {-1, -1}};
map<pair<int, int>, int> m, visited;
pair<int, int> a[N];
void solve(){
cin >> n >> t;
for(int i = 0; i < n; ++i){
cin >> a[i].first >> a[i].second;
m[a[i]] = i;
}
queue<pair<int, int>> q[3];
int k = 0;
visited[a[0]] = 1;
q[k].push(a[0]);
vector<int> ans;
while(!q[0].empty() || !q[1].empty() || !q[2].empty()){
while(q[k].empty()) (k+=1)%=3;
auto v = q[k].front(); q[k].pop();
ans.pb(m[v]);
for(int i = 0; i < 8; ++i){
int x = v.first + b[i][0];
int y = v.second + b[i][1];
if(!visited[{x, y}] && m[{x, y}] > 0){
q[(k + (i > 3) + 1) % 3].push({x, y});
visited[{x, y}] = 1;
}
}
}
if(ans.size() == n){
cout << "YES\n";
for(int k: ans) cout << k + 1 << '\n';
}else cout << "NO";
}
int main(){
cin.tie(0); ios::sync_with_stdio(0);
int T = 1, aa;
// cin >> T;aa=T;
while(T--){
// cout << "Case #" << aa-T << ": ";
solve();
cout << '\n';
}
return 0;
}
Compilation message (stderr)
skyscrapers.cpp: In function 'void solve()':
skyscrapers.cpp:44:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
44 | if(ans.size() == n){
| ~~~~~~~~~~~^~~~
skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:56:16: warning: unused variable 'aa' [-Wunused-variable]
56 | int T = 1, aa;
| ^~
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