#include<bits/stdc++.h>
#define N 300010
using namespace std;
const int B = 500;
int n, m, q;
struct DSU{
int pai[N], sz[N], val[N];
void init(int n){
for(int i = 1;i <= n;i++){
pai[i] = i;
sz[i] = 1;
val[i] = 0;
}
}
int find(int x){
if(x == pai[x]) return x;
int p = find(pai[x]);
val[x] += val[p];
val[x] %= 2;
pai[x] = p;
return pai[x];
}
void join(int a, int b){
int va, vb;
find(a); find(b);
va = val[a];
vb = val[b];
int sa = a, sb = b;
a = find(a);
b = find(b);
if(sz[a] > sz[b]){
swap(a, b);
swap(va, vb);
swap(sa, sb);
}
pai[a] = b;
sz[b] += sz[a];
val[a] = (((va+vb) % 2) == 0 ? 1 : 0);
}
bool query(int a, int b){
find(a);find(b);
// cout << a << ' ' << pai[a] << ' ' << val[a] << '\n' << b << ' ' << pai[b] << ' ' << val[b] << '\n';
if(((val[a] + val[b]) % 2) == 0) return true;
return false;
}
} dsu;
vector <pair <int, int>> arestas;
vector <array <int, 3>> query;
int resp[N];
int main(){
ios::sync_with_stdio(false); cin.tie(0);
cin >> n >> m >> q;
for(int i = 1;i <= m;i++){
int a, b;
cin >> a >> b;
arestas.push_back({a, b});
}
for(int i = 1;i <= q;i++){
int a, b;
cin >> a >> b;
query.push_back({a, b, i});
}
sort(query.begin(), query.end());
int con = 0;
bool res = false;
dsu.init(n);
for(int i = 1;i <= m;i++){
if(con == q) break;
if(dsu.find(arestas[i-1].first) == dsu.find(arestas[i-1].second)){
if(dsu.query(arestas[i-1].first, arestas[i-1].second)){
res = true;
}
}
else{
dsu.join(arestas[i-1].first, arestas[i-1].second);
}
while(con < q and i == query[con][1]){
if(res){
resp[query[con][2]] = 1;
}
else{
resp[query[con][2]] = 0;
}
con++;
}
}
for(auto &x : query){
x[0] = x[2];
}
sort(query.begin(), query.end());
for(int i = 1;i <= n;i++){
cout << i << ' ' << dsu.val[i] << ' ' << dsu.pai[i] << '\n';
}
cout << '\n';
for(auto x : query){
if(resp[x[0]] == 1){
cout << "YES\n";
}
else{
cout << "NO\n";
}
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |