Submission #367304

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
367304	2021-02-16 20:19:23	PurpleCrayon	Stations (IOI20_stations)	C++17	100 / 100	1148 ms	1368 KiB

stations

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#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
#define sz(v) int(v.size())
int tt;
vector<int> ans;
vector<vector<int>> adj;
void dfs(int c=0, int p=-1, bool b=0){
    if (!b) ans[c] = tt++;
    for (auto nxt : adj[c]) if (nxt != p) dfs(nxt, c, b^1);
    if (b) ans[c] = tt++;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    ans.assign(n, -1), adj.assign(n, vector<int>()), tt=0;
    for (int i = 0; i < n-1; i++) 
        adj[u[i]].push_back(v[i]), adj[v[i]].push_back(u[i]);
    dfs();
    return ans;
}
int find_next_station(int s, int t, vector<int> c) {
    if (s == 0){ //ans for the root
        for (auto nxt : c) if (nxt >= t) return nxt;
        assert(false);
    }
    bool b=s>c[0];
 
 
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Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:48:13: warning: unused variable 'ans' [-Wunused-variable]
   48 |         int ans=-1;
      |             ^~~

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