oj.uz

답안 #583440

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
583440 2022-06-25T11:15:31 Z keta_tsimakuridze LOSTIKS (INOI20_lostiks) C++14
0 / 100
 232 ms 11728 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define f first
#define s second
#define endl "\n"
const int N = 2e5 + 5, mod = 1e9 + 7; //!
int t, p[N], need[N], rep[N], id[N], d[N], n,  vis[N], par[N],rep2[N], f[N];
int room[N];	
//int n;
vector<int>adj[N];
vector<pair<int, pair<int, pii> > > V[25];
int find(int u) {
	return (par[u] == u ? u : par[u] = find(par[u]));
}
void merge(int u, int v) {
	u = find(u), v = find(v);
	par[u] = v;
}
void dfs(int u, int P) {
	p[u] = P; 
	for(int i = 0; i < V[u].size(); i++) {
		if(V[u][i].f == p[u]) continue;
		rep[V[u][i].f] = V[u][i].s.s.f;
		rep2[V[u][i].f] = V[u][i].s.s.s;
		room[V[u][i].f] = V[u][i].s.f;
		dfs(V[u][i].f, u);
	}
}

int dist(int u,int v) {
	
	queue<int> q;
	for(int i = 1; i <= n; i++) d[i] = n + 5;
	d[u] = 0;
	q.push(u);
	while(q.size()) {
		int u = q.front(); 
		q.pop();
		for(int i = 0; i < adj[u].size(); i++) {
			if(d[adj[u][i]] == n + 5) {
				d[adj[u][i]] = d[u] + 1;
				q.push(adj[u][i]);
			}
		}
	}
	return d[v];
}
main() {
//	ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);

	cin >> n;
	int S, T;
	cin >> S >> T;
	vector< pair<pii, int> > E;
	for(int i = 1; i <= n; i++) par[i] = i;
	set<int> s1;
	for(int i = 2; i <= n; i++) {
		int u, v, t;
		cin >> u >> v >> t;
		adj[u].push_back(v);
		adj[v].push_back(u);
		if(t) {
			E.push_back({{u,v}, t});
			assert(!s1.count(t));
			s1.insert(t);
		}
		else merge(u, v);
	}
	int cur = 0;
	for(int i = 1; i <= n; i++) {
		if(find(i) == i) {
			id[i] = ++cur;
		}
	}
	for(int i = 0; i < E.size(); i++) {
		V[id[find(E[i].f.f)]].push_back({id[find(E[i].f.s)], {E[i].s, {E[i].f.f, E[i].f.s}}});
		V[id[find(E[i].f.s)]].push_back({id[find(E[i].f.f)], {E[i].s, {E[i].f.s, E[i].f.f}}});
	}
	dfs(id[find(S)], 0);
	vis[id[find(S)]] = 1;
	int u = id[find(T)];
	stack<int> s; 
	vector<int> v;
	f[u] = 1;
	while(!vis[u]) {
		s.push(u);
		need[u] = 1;
		u = p[u];
	}
	cur = S;
	int ans = 0, cc = 0;
	while(s.size()) {
		int u = s.top(), x = room[u];
		
		if(vis[u]) continue;
		++cc;
		if(cc > 25) {
			cout << -1;
			return 0;
		}
		if(vis[id[find(x)]]) { 
			ans += dist(cur, x) + dist(x, rep[u]);
			vis[u] = 1;
			if(f[u]) ++ans, cur = rep2[u], --f[u];
			else cur = rep[u];
			need[u] = 0;
			s.pop(); 
			continue;
		}
		vector<int> v;
		x = id[find(x)];
		f[x]++;
		while(!vis[x]) {
			s.push(x);
			x = p[x];
		}
	}
	ans += dist(cur, T);
	cout << ans;
}

Compilation message

Main.cpp: In function 'void dfs(long long int, long long int)':
Main.cpp:23:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, std::pair<long long int, std::pair<long long int, long long int> > > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for(int i = 0; i < V[u].size(); i++) {
      |                 ~~^~~~~~~~~~~~~
Main.cpp: In function 'long long int dist(long long int, long long int)':
Main.cpp:41:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   for(int i = 0; i < adj[u].size(); i++) {
      |                  ~~^~~~~~~~~~~~~~~
Main.cpp: At global scope:
Main.cpp:50:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   50 | main() {
      | ^~~~
Main.cpp: In function 'int main()':
Main.cpp:77:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<std::pair<long long int, long long int>, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |  for(int i = 0; i < E.size(); i++) {
      |                 ~~^~~~~~~~~~

Subtask #1
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 5004 KB Output is correct
3 Correct 171 ms 11728 KB Output is correct
4 Correct 141 ms 10380 KB Output is correct
5 Correct 115 ms 10316 KB Output is correct
6 Correct 128 ms 10272 KB Output is correct
7 Correct 179 ms 10320 KB Output is correct
8 Correct 232 ms 10468 KB Output is correct
9 Correct 152 ms 10508 KB Output is correct
10 Correct 170 ms 10476 KB Output is correct
11 Correct 169 ms 10512 KB Output is correct
12 Correct 149 ms 9912 KB Output is correct
13 Incorrect 122 ms 9904 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #2
0 / 36.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Incorrect 3 ms 5076 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 5004 KB Output is correct
3 Correct 171 ms 11728 KB Output is correct
4 Correct 141 ms 10380 KB Output is correct
5 Correct 115 ms 10316 KB Output is correct
6 Correct 128 ms 10272 KB Output is correct
7 Correct 179 ms 10320 KB Output is correct
8 Correct 232 ms 10468 KB Output is correct
9 Correct 152 ms 10508 KB Output is correct
10 Correct 170 ms 10476 KB Output is correct
11 Correct 169 ms 10512 KB Output is correct
12 Correct 149 ms 9912 KB Output is correct
13 Incorrect 122 ms 9904 KB Output isn't correct
14 Halted 0 ms 0 KB -