//Never stop trying
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
typedef string str;
typedef long long ll;
#define int ll
typedef double db;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
typedef vector<str> vs;
typedef vector<ld> vd;
#define pb push_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
const int MOD = 1e9 + 7; //998244353
const ll INF = 1e18;
const int MX = 2e5 + 10;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up
template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))
#define dbg(x) cerr << " - " << #x << " : " << x << endl;
#define dbgs(x,y) cerr << " - " << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << " - " << #v << " : " << endl << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
void IO() {
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
}
//right left down up
int op(int m){
if(m==0) return 1;
if(m==1) return 0;
if(m==2) return 3;
return 2;
}
bool check(int m, int mm){
if(m==mm || m==op(m)) return false;
return true;
}
int32_t main() {
boost;
int N,t; cin>>N>>t;
vi X(N),Y(N);
map<pi,bool> here;
map<pi,int> mp;
FOR(i,0,N){
cin>>X[i]>>Y[i];
here[{X[i],Y[i]}]=true;
mp[{X[i],Y[i]}]=i;
}
queue<int> q; q.push(0);
bool vis[N]; FOR(i,0,N) vis[i]=false;
vis[0]=true;
vi res;
while(!q.empty()){
int idx=q.front();
q.pop();
res.pb(idx+1);
int x=X[idx],y=Y[idx];
FOR(m,0,4){
int nwx=x+nx[m],nwy=y+ny[m];
if(here.count({nwx,nwy}) && !vis[mp[{nwx,nwy}]]){
int ni=mp[{nwx,nwy}];
vis[ni]=true;
q.push(ni);
}
FOR(mm,0,4)if(check(m,mm)){
nwx=nwx+nx[mm],nwy=nwy+ny[mm];
if(here.count({nwx,nwy}) && !vis[mp[{nwx,nwy}]]){
int ni=mp[{nwx,nwy}];
vis[ni]=true;
q.push(ni);
}
}
}
}
if(sz(res)<N) cout << "NO" << endl;
else{
cout << "YES" << endl;
for(auto x: res) cout << x << endl;
}
return 0;
}
/* Careful!!!
.Array bounds
.Infinite loops
.Uninitialized variables / empty containers
.Order of input
Some insights:
.Binary search
.Graph representation
.Write brute force code
.Change your approach
*/
Compilation message
skyscrapers.cpp:3: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
3 | #pragma GCC optimization ("O3")
|
skyscrapers.cpp:4: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
4 | #pragma GCC optimization ("unroll-loops")
|
skyscrapers.cpp: In function 'void IO()':
skyscrapers.cpp:50:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
50 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
skyscrapers.cpp:51:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
51 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
ans=YES N=1 |
| 2 |
Correct |
1 ms |
384 KB |
ans=YES N=4 |
| 3 |
Correct |
0 ms |
384 KB |
ans=NO N=4 |
| 4 |
Incorrect |
1 ms |
384 KB |
Contestant did not find solution |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
ans=YES N=1 |
| 2 |
Correct |
1 ms |
384 KB |
ans=YES N=4 |
| 3 |
Correct |
0 ms |
384 KB |
ans=NO N=4 |
| 4 |
Incorrect |
1 ms |
384 KB |
Contestant did not find solution |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
ans=YES N=1 |
| 2 |
Correct |
1 ms |
384 KB |
ans=YES N=4 |
| 3 |
Correct |
0 ms |
384 KB |
ans=NO N=4 |
| 4 |
Incorrect |
1 ms |
384 KB |
Contestant did not find solution |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
640 KB |
ans=NO N=1934 |
| 2 |
Correct |
2 ms |
640 KB |
ans=NO N=1965 |
| 3 |
Incorrect |
5 ms |
640 KB |
Contestant did not find solution |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
ans=YES N=1 |
| 2 |
Correct |
1 ms |
384 KB |
ans=YES N=4 |
| 3 |
Correct |
0 ms |
384 KB |
ans=NO N=4 |
| 4 |
Incorrect |
1 ms |
384 KB |
Contestant did not find solution |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
275 ms |
11504 KB |
ans=NO N=66151 |
| 2 |
Correct |
75 ms |
9976 KB |
ans=NO N=64333 |
| 3 |
Incorrect |
301 ms |
11888 KB |
Contestant did not find solution |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
640 KB |
ans=NO N=1934 |
| 2 |
Correct |
2 ms |
640 KB |
ans=NO N=1965 |
| 3 |
Incorrect |
5 ms |
640 KB |
Contestant did not find solution |
| 4 |
Halted |
0 ms |
0 KB |
- |
