Submission #705750

#	Time	Username	Problem	Language	Result	Execution time	Memory
705750		PenguinsAreCute	Stations (IOI20_stations)	C++17	52.32 / 100	893 ms	792 KiB

stations

#include <bits/stdc++.h>
using namespace std;
#define MAXN 1005
vector<int> a[MAXN];
int pre[MAXN], post[MAXN];
int c;
void dfs(int x, int p) {
	pre[x] = c++;
	for(auto i: a[x]) if(i != p) dfs(i, x);
	post[x] = c - 1;
}
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	c = 0;
	for(int i = 0; i < MAXN; i++) a[i].clear();
	std::vector<int> labels(n);
	for(int i = 0; i < n - 1; i++) {
		a[u[i]].push_back(v[i]);
		a[v[i]].push_back(u[i]);
	}
	dfs(0, -1);
	for (int i = 0; i < n; i++) {
		labels[i] = pre[i] * 1000 + post[i];
	}
	return labels;
}
int find_next_station(int s, int t, std::vector<int> c) {
	if(s / 1000 > t / 1000 || t / 1000 > s % 1000) {
		for(auto v: c) if(v / 1000 <= s / 1000 && s / 1000 <= v % 1000) return v;
	}
	for(auto v: c) if(v / 1000 <= t / 1000 && t / 1000 <= v % 1000 && !(v / 1000 <= s / 1000 && s / 1000 <= v % 1000)) return v;
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:31:1: warning: control reaches end of non-void function [-Wreturn-type]
   31 | }
      | ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 26.3205 / 61