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Submission #835337

# Submission time Handle Problem Language Result Execution time Memory
835337 2023-08-23T13:22:39 Z welleyth Stations (IOI20_stations) C++17
100 / 100
 869 ms 940 KB 
#include "stations.h"
#include <bits/stdc++.h>
using namespace std;

constexpr int N = (int)1e3;

int tin[N],tout[N];
int timer = 0;

vector<int> g[N];
int id[N];
int d[N];
int c = 0;
vector<int> labels;

mt19937 rnd(time(nullptr));

int sz[N];
vector<int> values;

void dfs(int v,int pr = -1){
	tin[v] = timer++;
	for(auto& to : g[v]){
		if(to == pr) continue;
		if(id[v] == 0)
			id[to] = ++c;
		else
			id[to] = id[v];
		d[to] = d[v] + 1;
		dfs(to,v);
	}
	tout[v] = timer++;
	if(d[v] % 2 == 0){
		values.push_back(tin[v]);
	} else {
		values.push_back(tout[v]);
	}
	return;
}

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	for(int i = 0; i < n; i++) g[i].clear();
	timer = 0;
	labels.clear();
	labels.resize(n);
	memset(id,0,sizeof id);
	memset(d,0,sizeof d);
	c = 0;
	for(int i = 0; i < n-1; i++){
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	values.clear();
	d[0] = 0;
	dfs(0);
	sort(values.begin(),values.end());
	values.erase(unique(values.begin(),values.end()),values.end());
	for(int i = 0; i < n; i++){
		if(d[i] % 2 == 0){
			labels[i] = lower_bound(values.begin(),values.end(),tin[i]) - values.begin();
		} else {
			labels[i] = lower_bound(values.begin(),values.end(),tout[i]) - values.begin();
		}
	}
	return labels;
}

bool upper(int a,int b){
	return tin[a] <= tin[b] && tout[a] >= tout[b];
}

int find_next_station(int s, int t, std::vector<int> c) {
	int tinS = 2*N, toutS = -1, tinT = 2*N, toutT = -1;
	bool isToutS = true;
	for(auto& to : c){
		isToutS &= s > to; 
	}
	if(isToutS)
		toutS = s;
	else
		tinS = s;
	tinT = toutT = t;
	int pr = -1;
	for(auto& to : c){
		int in,out;
		if(!isToutS){
			out = to;
			if(pr == -1 || out > pr)
				pr = to;
		}
		else{
			in = to;
			if(pr == -1 || in < pr)
				pr = to;
		}
	}

	int go = -1;

	for(auto& to : c){
		// if(to == pr) continue;
		int in,out;
		if(!isToutS){
			out = to;
			if(tinT < tinS)
				return pr;
			if(out >= tinT && (go == -1 || out < go))
				go = to;
		}
		else{
			in = to;
			if(toutT > toutS)
				return pr;
			if(in <= toutT && (go == -1 || in > go))
				go = to;
		}
	}
	if(go == -1)
		return pr;

	return go;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 493 ms 796 KB Output is correct
2 Correct 440 ms 792 KB Output is correct
3 Correct 869 ms 664 KB Output is correct
4 Correct 488 ms 668 KB Output is correct
5 Correct 424 ms 668 KB Output is correct
6 Correct 313 ms 876 KB Output is correct
7 Correct 396 ms 800 KB Output is correct
8 Correct 1 ms 748 KB Output is correct
9 Correct 2 ms 756 KB Output is correct
10 Correct 0 ms 684 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 375 ms 824 KB Output is correct
2 Correct 345 ms 704 KB Output is correct
3 Correct 842 ms 668 KB Output is correct
4 Correct 568 ms 672 KB Output is correct
5 Correct 445 ms 696 KB Output is correct
6 Correct 329 ms 664 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 393 ms 800 KB Output is correct
2 Correct 392 ms 792 KB Output is correct
3 Correct 632 ms 668 KB Output is correct
4 Correct 693 ms 664 KB Output is correct
5 Correct 429 ms 676 KB Output is correct
6 Correct 387 ms 804 KB Output is correct
7 Correct 339 ms 940 KB Output is correct
8 Correct 2 ms 748 KB Output is correct
9 Correct 3 ms 748 KB Output is correct
10 Correct 0 ms 748 KB Output is correct
11 Correct 385 ms 804 KB Output is correct
12 Correct 335 ms 916 KB Output is correct
13 Correct 345 ms 820 KB Output is correct
14 Correct 306 ms 668 KB Output is correct
15 Correct 43 ms 748 KB Output is correct
16 Correct 71 ms 672 KB Output is correct
17 Correct 62 ms 672 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 579 ms 672 KB Output is correct
2 Correct 461 ms 664 KB Output is correct
3 Correct 417 ms 800 KB Output is correct
4 Correct 1 ms 760 KB Output is correct
5 Correct 3 ms 748 KB Output is correct
6 Correct 1 ms 748 KB Output is correct
7 Correct 484 ms 672 KB Output is correct
8 Correct 589 ms 668 KB Output is correct
9 Correct 680 ms 668 KB Output is correct
10 Correct 523 ms 720 KB Output is correct
11 Correct 2 ms 748 KB Output is correct
12 Correct 5 ms 692 KB Output is correct
13 Correct 3 ms 744 KB Output is correct
14 Correct 3 ms 748 KB Output is correct
15 Correct 1 ms 748 KB Output is correct
16 Correct 465 ms 672 KB Output is correct
17 Correct 440 ms 676 KB Output is correct
18 Correct 349 ms 676 KB Output is correct
19 Correct 376 ms 672 KB Output is correct
20 Correct 302 ms 676 KB Output is correct

Subtask #5
61.0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 425 ms 824 KB Output is correct
2 Correct 331 ms 800 KB Output is correct
3 Correct 523 ms 660 KB Output is correct
4 Correct 637 ms 672 KB Output is correct
5 Correct 395 ms 736 KB Output is correct
6 Correct 285 ms 672 KB Output is correct
7 Correct 408 ms 672 KB Output is correct
8 Correct 1 ms 748 KB Output is correct
9 Correct 3 ms 748 KB Output is correct
10 Correct 0 ms 748 KB Output is correct
11 Correct 305 ms 688 KB Output is correct
12 Correct 361 ms 672 KB Output is correct
13 Correct 583 ms 668 KB Output is correct
14 Correct 470 ms 676 KB Output is correct
15 Correct 396 ms 668 KB Output is correct
16 Correct 346 ms 676 KB Output is correct
17 Correct 529 ms 676 KB Output is correct
18 Correct 439 ms 796 KB Output is correct
19 Correct 432 ms 796 KB Output is correct
20 Correct 285 ms 676 KB Output is correct
21 Correct 34 ms 748 KB Output is correct
22 Correct 64 ms 728 KB Output is correct
23 Correct 54 ms 672 KB Output is correct
24 Correct 3 ms 756 KB Output is correct
25 Correct 5 ms 760 KB Output is correct
26 Correct 2 ms 748 KB Output is correct
27 Correct 1 ms 756 KB Output is correct
28 Correct 1 ms 748 KB Output is correct
29 Correct 446 ms 668 KB Output is correct
30 Correct 481 ms 672 KB Output is correct
31 Correct 353 ms 676 KB Output is correct
32 Correct 325 ms 672 KB Output is correct
33 Correct 321 ms 672 KB Output is correct
34 Correct 263 ms 800 KB Output is correct
35 Correct 302 ms 804 KB Output is correct
36 Correct 253 ms 796 KB Output is correct
37 Correct 421 ms 792 KB Output is correct
38 Correct 262 ms 668 KB Output is correct
39 Correct 418 ms 744 KB Output is correct
40 Correct 294 ms 672 KB Output is correct
41 Correct 343 ms 736 KB Output is correct
42 Correct 49 ms 812 KB Output is correct
43 Correct 74 ms 664 KB Output is correct
44 Correct 119 ms 676 KB Output is correct
45 Correct 103 ms 672 KB Output is correct
46 Correct 268 ms 672 KB Output is correct
47 Correct 192 ms 812 KB Output is correct
48 Correct 39 ms 844 KB Output is correct
49 Correct 45 ms 792 KB Output is correct