Submission #372927

#	Time	Username	Problem	Language	Result	Execution time	Memory
372927		Jarif_Rahman	Stations (IOI20_stations)	C++17	0 / 100	898 ms	5772 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;
struct graph{
    int n;
    vector<vector<int>> v;
    graph(){}
    graph(int nn){
        n = nn;
        v.assign(n, {});
    }
    void add(vector<int> aa, vector<int> bb){
        for(int i = 0; i < aa.size(); i++){
            v[aa[i]].pb(bb[i]);
            v[bb[i]].pb(aa[i]);
        }
    }
}g(1e5);
int r = 0, rr = 0;
vector<int> label(int n, int k, vector<int> aa, vector<int> bb){
    vector<int> lb(n);
    for(int i = 0; i < n; i++) lb[i] = rr++;
    for(int i = 0; i < n-1; i++) aa[i] = lb[aa[i]], bb[i] = lb[bb[i]];
    g.add(aa, bb);
    return lb;
}
vector<int> cur;
int ans;
void dfs(int nd, int ss, int tt){
    if(nd == tt){
        ans = cur.front();
        return;
    }
    if(ans != -1) return;
    for(int x: g.v[nd]) if(x!=ss){
        cur.pb(x);
        dfs(x, nd, tt);
        cur.pop_back();
    }
}
int find_next_station(int s, int t, vector<int> c){
    cur.clear();
    ans = -1;
    dfs(s, -1, t);
    return ans;
}

Compilation message (stderr)

stations.cpp: In member function 'void graph::add(std::vector<int>, std::vector<int>)':
stations.cpp:18:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |         for(int i = 0; i < aa.size(); i++){
      |                        ~~^~~~~~~~~~~

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