Submission #362022

#	Time	Username	Problem	Language	Result	Execution time	Memory
362022		valerikk	Stations (IOI20_stations)	C++17	10 / 100	1055 ms	1080 KiB

stations

#include <bits/stdc++.h>

using namespace std; 

const int N = 1000;

vector<int> g[N];
int t = 0;
vector<int> l;

int dfs(int v, int p = -1) {
    l[v] = t++;
    int mx = l[v];
    for (int u : g[v]) {
        if (u != p) mx = max(mx, dfs(u, v));
    }
    l[v] *= N;
    l[v] += mx;
    return mx;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    for (int i = 0; i < n; i++) g[i].clear();
    for (int i = 0; i < n - 1; i++) {
        g[u[i]].push_back(v[i]);
        g[v[i]].push_back(u[i]);
    }
    l.resize(n);
    dfs(0);
    return l;
}

int find_next_station(int s, int t, vector<int> c) {
    assert(s != t);
    int p;
    for (int v : c) {
        if (v / N <= s / N && s / N <= v % N) p = v; else {
            if (v / N <= t / N && t / N <= v % N) return v;
        } 
    }
    return p;
}

#ifdef LOCAL
int main(){
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
#endif 
    ios::sync_with_stdio(false);
    cin.tie(0);
    return 0;
}
#endif

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:35:9: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
   35 |     int p;
      |         ^

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