Submission #926701

#	Time	Username	Problem	Language	Result	Execution time	Memory
926701		ByeWorld	Stations (IOI20_stations)	C++14	0 / 100	4 ms	1208 KiB

stations

#include "stations.h"
#include <vector>
#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii,int> ipii;
const int MAXN = 2e3+10;

int n, k;
vector <int> adj[MAXN];

vector <int> vec; int dep[MAXN];
void make(int id, int par, int dp){
	vec.pb(id); dep[id] = dp;
	for(auto in : adj[id]){
		if(in == par) continue;
		make(in, id, dp+1);
	}
}

vector<int> label(int N, int K, vector<int> u, vector<int> v) {
	n = N; k = K;
	vec.clear();
	for(int i=0; i<=n; i++){
		adj[i].clear(); dep[i] = -1;
	}

	for(int i=0; i<n-1; i++){
		adj[u[i]].pb(v[i]); adj[v[i]].pb(u[i]);
	}

	for(int i=0; i<n; i++){
		if(adj[i].size() != 1) continue;
		make(i, -1, 0);
		break;
	}
	// for(int i=0; i<n; i++){
	// 	for(int j=0; j<n; j++){
	// 		if(i!=j && dep[i]==dep[j]) assert(false);
	// 	}
	// }
	vector<int> labels(n);
	for (int i = 0; i < n; i++) {
		labels[i] = i;
	}
	// for(auto in : vec) cout << in << " p\n";
	// for(int i=0; i<n; i++) cout << i << ' ' << dep[i] << " xx\n";
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	//if(s>=n || t>=n) assert(0);
	bool b = 0;
	for(int i=0; i<vec.size(); i++){
		if(vec[i] == s) b = 1;
	}
	if(!b) assert(false);

	int las = -1, ans = -1;
	for(int i=0; i<vec.size(); i++){
		if(i!=0 && vec[i-1]==s){
			ans = vec[i];
			break;
		}
		if(vec[i]==t) break;
	}
	for(int i=vec.size()-1; i>=0; i--){
		if(i!=n-1 && vec[i+1]==s){
			ans = vec[i];
			break;
		}
		if(vec[i]==t) break;
	}

	return ans;
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:57:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |  for(int i=0; i<vec.size(); i++){
      |               ~^~~~~~~~~~~
stations.cpp:63:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |  for(int i=0; i<vec.size(); i++){
      |               ~^~~~~~~~~~~
stations.cpp:62:6: warning: unused variable 'las' [-Wunused-variable]
   62 |  int las = -1, ans = -1;
      |      ^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 0 / 10
• Subtask 5: 0 / 61