Submission #1241251

#	Time	Username	Problem	Language	Result	Execution time	Memory
1241251		ghammazhassan	Stations (IOI20_stations)	C++20	0 / 100	1205 ms	2162688 KiB

stations

#include <bits/stdc++.h>
using namespace std;
const int N=2e3+5;
vector<int>a[N];
int in[N],out[N],dep[N];
int ce=0;
int ki;
int ni;
void dfs(int x,int y,vector<int> &labels){
	if (x!=0){
		dep[x]=dep[y]+1;
	}
	in[x]=ce;
	for (int i:a[x]){
		if (i==y)continue;
		dfs(i,x,labels);
	}
	out[x]=ce;
	ce++;
	// if (dep[x]%2==0){
		labels[x]=out[x];
		// cout << x << " " << labels[x] << endl;
	// }
	// else{
	// 	labels[x]=in[x];
	// }
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	vector<int> labels(n);
	ki=k;
	ni=n;
	for (int i = 0; i < n; i++) {
		labels[i] = i;
	}
	for (int i=0;i<n-1;i++){
		int x=u[i];
		int y=v[i];
		a[x].push_back(y);
		a[y].push_back(x);
	}
	dfs(0,-1,labels);
	for (int i=0;i<=n;i++){
		a[i].clear();
	}
	for (int i=0;i<n-1;i++){
		int x=labels[u[i]];
		int y=labels[v[i]];
		a[x].push_back(y);
		a[y].push_back(x);
	}
	return labels;
}
bool dfs2(int x,int y,int t){
	bool f=0;
	for (int i:a[x]){
		if (i==y)continue;
		if (i==t){
			f=1;
			break;
		}
		f=dfs2(i,x,t);
	}
	return f;
}
int find_next_station(int s, int t, vector<int> c) {
	for (int i:c){
		if (dfs2(i,s,t) or i==t){
			// cout << i << endl;
			return i;
		}
	}
	// return 6;
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:74:1: warning: control reaches end of non-void function [-Wreturn-type]
   74 | }
      | ^

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