Submission #673524

#	Time	Username	Problem	Language	Result	Execution time	Memory
673524		Essa2006	Stations (IOI20_stations)	C++14	0 / 100	2 ms	592 KiB

stations

#include<bits/stdc++.h>
using namespace std;
#define ll long long 
#define endl '\n'
#define FF first
#define SS second
#define all(a) a.begin(), a.end()
#define mod (ll)(1000000007)
vector<int>Vis;
vector<vector<int>>A;
vector<array<int, 2>>dp;
// time, max_time
int time_=0;
void dfs(int ind){
    Vis[ind]=1, dp[ind][0]=dp[ind][1]=time_++;
    for(int i=0;i<A[ind].size();i++){
        if(!Vis[A[ind][i]]){
            dfs(A[ind][i]);
            dp[ind][1]=max(dp[ind][1], dp[A[ind][i]][1]);
        }    
    }
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    vector<int>labels(n);
    for(int i=0;i<n;i++)
        labels[i]=i;
    dp.clear(), Vis.clear(), A.clear();
    dp.resize(n), Vis.resize(n), A.resize(n);
    while(--n)
        A[u[n]].push_back(v[n]), A[v[n]].push_back(u[n]);
    dfs(0);
    return labels;
}

int find_next_station(int s, int t, vector<int> c) {
    for(int i=0;i<c.size();i++){
        if(dp[t][0]<dp[s][0]){
            if(dp[c[i]][0]<=dp[s][0])
                return c[i];
        }
        else{
            if(dp[t][0]>=dp[c[i]][0] && dp[t][0]<=dp[c[i]][1])
                return c[i];
        }
    }
}

Compilation message (stderr)

stations.cpp: In function 'void dfs(int)':
stations.cpp:16:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for(int i=0;i<A[ind].size();i++){
      |                 ~^~~~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:36:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for(int i=0;i<c.size();i++){
      |                 ~^~~~~~~~~
stations.cpp:46:1: warning: control reaches end of non-void function [-Wreturn-type]
   46 | }
      | ^

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