Submission #931498

#	Time	Username	Problem	Language	Result	Execution time	Memory
931498		beaboss	Stations (IOI20_stations)	C++14	0 / 100	581 ms	944 KiB

stations

#include "bits/stdc++.h"

using namespace std;

#define s second
#define f first
#define pb push_back

typedef long long ll;

typedef pair<int, int> pii;
typedef vector<pii> vpii;

typedef vector<int> vi;

#define FOR(i, a, b) for (int i = (a); i<b; i++)

bool ckmin(int& a, int b){ return b < a ? a = b, true : false; }

bool ckmax(int& a, int b){ return b > a ? a = b, true : false; }

const int N = 1010;
vi adj[N];
vi out;
int cnt = 0;
void dfs(int cur, int d = 0, int p = -1) {
	if (d % 2 == 0) out[cur] = cnt;
	cnt++;
	for (auto val: adj[cur]) if (val != p) dfs(val, d + 1, cur);

	if (d % 2 == 1) out[cur] = cnt;
	cnt++; 
}



vi label(int n, int k, vi u, vi v) {
	cnt = 0;
	out.resize(0);
	FOR(i, 0, N) adj[i].clear();


	FOR(i, 0, u.size()) {
		adj[u[i]].pb(v[i]);
		adj[v[i]].pb(u[i]);
	}

	out.resize(n);

	dfs(0);

	vi other = out;
	sort(other.begin(), other.end());
	FOR(i, 0, out.size()) out[i] = lower_bound(other.begin(), other.end(), out[i]) - other.begin();

	return out;
}

int find_next_station(int s, int t, vi c) {
	assert(s <= c[0] || s >= c[c.size() - 1]);

	if (s < c[0]) { // everything is end
		int p = c[c.size() - 1];
		int st = s; // inclusive boud
		int en = s; // inclusive
		if (c.size() >= 2) en = max(en, c[c.size() - 2]-1);
		if (t > en || t < st) return p;

		return *lower_bound(c.begin(), c.begin() + c.size() - 1, t);
	} else {
		int p = c[0];
		int st = s-1; // inclusive
		int en = s-1; // inclusive
		// cout << st << en << endl;
		if (c.size() >= 2) st = min(st, c[1]);
		// cout << st << en << endl;
		if (t > en || t < st) return p;

		// cout << t << endl;
		return *prev(upper_bound(c.begin() + 1, c.end(), t), 1);
	}
	

	
 

}

// int main() {
// 	ios::sync_with_stdio(false);
// 	cin.tie(nullptr);

// 	int n;
// 	// cin >> n;

// 	// vi a(n - 1), b(n-1);

// 	// FOR(i, 0, n-1) {
// 	// 	cin >> a[i] >> b[i];
// 	// }

// 	// vi res = label(n, n-1, a, b);
// 	// for (auto val: res) cout << val << endl;

// 	cout << find_next_station(4, 2, {1, 2}) << endl;
// }

Compilation message (stderr)

stations.cpp: In function 'vi label(int, int, vi, vi)':
stations.cpp:18:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 | #define FOR(i, a, b) for (int i = (a); i<b; i++)
......
   45 |  FOR(i, 0, u.size()) {
      |      ~~~~~~~~~~~~~~                      
stations.cpp:45:2: note: in expansion of macro 'FOR'
   45 |  FOR(i, 0, u.size()) {
      |  ^~~
stations.cpp:18:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 | #define FOR(i, a, b) for (int i = (a); i<b; i++)
......
   56 |  FOR(i, 0, out.size()) out[i] = lower_bound(other.begin(), other.end(), out[i]) - other.begin();
      |      ~~~~~~~~~~~~~~~~                    
stations.cpp:56:2: note: in expansion of macro 'FOR'
   56 |  FOR(i, 0, out.size()) out[i] = lower_bound(other.begin(), other.end(), out[i]) - other.begin();
      |  ^~~

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