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ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#63920	#3996. Race	ltunjic	WA	7ms	16916kb	C++14	1.7kb	2022-11-23 17:31:28	2022-11-23 17:31:30

Judging History

This is the latest submission verdict.

[2023-08-10 23:21:45]
System Update: QOJ starts to keep a history of the judgings of all the submissions.

[2022-11-23 17:31:30]
Judged

Verdict: WA
Time: 7ms
Memory: 16916kb

Show

[2022-11-23 17:31:28]
Submitted

answer

#include <bits/stdc++.h> 

#define X first
#define Y second
#define pb push_back

using namespace std; 

typedef pair<int, int> pii;

const int N = 2e5 + 10;
const int LOG = 30;

int n, m, q, k, dep[N], xr[N], base[N], comp[N];
int ans[N];
pii task[N];

vector<pii> g[N];
vector<int> space, t[N];

bool add(int x, bool flag){
	while(x && base[__lg(x)] != -1){
		x ^= space[base[__lg(x)]];
	}  
	if(flag && x){
		base[__lg(x)] = space.size();
		space.pb(x);
	}
	return x == 0;
}

void dfs(int u, int c){
	comp[u] = c;
	for(pii e : g[u]){
		int v = e.X, val = e.Y;
		if(comp[v]){
			continue;
		}
		dep[v] = dep[u] + 1;
		xr[v] = xr[u] ^ (1 << val);
		dfs(v, c);
	}
}

void solve(int u){
	for(pii e : g[u]){
		int v = e.X, val = e.Y;
		if(dep[v] <= dep[u]){
			bool res = add(xr[u] ^ xr[v] ^ (1 << val), true);
			continue;
		} else if(dep[v] == dep[u] + 1)
			solve(v);
	}
}

int main(){
	memset(base, -1, sizeof(base));
	scanf("%d%d%d%d", &n, &m, &k, &q);
	for(int i = 0; i < m; i++){
		int u, v, val;
		scanf("%d%d%d", &u, &v, &val);
		g[u].pb({v, val - 1});
		g[v].pb({u, val - 1});
	}
	for(int i = 1; i <= n; i++){
		if(comp[i]) continue;
		dfs(i, i);
	}
	for(int i = 0; i < q; i++){
		int u, v;
		scanf("%d%d", &u, &v);
		task[i] = {u, v};
		if(comp[u] == comp[v]){
			t[comp[u]].pb(i);
		}	
	}
	for(int i = 1; i <= n; i++){
		if(t[i].empty()) continue; 
		memset(base, -1, sizeof(base));
		solve(i);
		for(int ind : t[i]){
			int u = task[ind].X;
			int v = task[ind].Y;
			int val = xr[u] ^ xr[v];
			if(add(val, false) || add(((1 << k) - 1) ^ val, false)) ans[ind] = true;
		} 
	}
	for(int i = 0; i < q; i++){
		printf(ans[i] ? "Yes\n" : "No\n");
	}
	return 0;
}

Source code, Language: C++14

Details

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Test #1:

score: 100

Accepted

time: 7ms

memory: 16692kb

input:

output:

Yes
No
Yes
No

result:

ok 4 token(s): yes count is 2, no count is 2

Test #2:

score: 0

Accepted

time: 5ms

memory: 15188kb

input:

output:

No
No
Yes
Yes
No

result:

ok 5 token(s): yes count is 2, no count is 3

Test #3:

score: -100

Wrong Answer

time: 5ms

memory: 16916kb

input:

39 30 5 999
12 22 4
11 1 1
28 13 3
35 1 4
7 17 2
20 19 4
28 7 5
15 33 5
31 38 5
13 33 4
13 35 2
16 12 5
13 33 1
21 15 3
23 32 1
19 16 3
3 22 3
11 14 2
31 26 5
32 17 5
34 17 3
31 26 2
10 37 1
1 3 1
30 12 4
1 35 3
6 1 2
25 15 2
39 23 5
10 5 3
24 34
32 27
4 13
37 28
31 36
12 11
24 6
22 32
7 17
1 15
22 ...

output:

No
No
No
No
No
Yes
No
Yes
No
No
No
No
Yes
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
Yes
No
Yes
No
Yes
Yes
Yes
No
No
No
Yes
No
No
No
No
No
Yes
No
Yes
Yes
No
No
No
No
No
Yes
No
Yes
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
N...

result:

wrong answer expected NO, found YES [496th token]