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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#525752 | #3556. Making Friends on Joitter is Fun | Dimash | 0 | 2ms | 22372kb | C++17 | 2.0kb | 2024-08-20 21:43:39 | 2024-08-20 21:43:39 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 1e5 + 12, MOD = (int)1e9 + 7;
int n, m, p[N];
int get(int v) {
if(p[v] == v) return v;
return p[v] = get(p[v]);
}
set<int> s[N],g[N],t[N],gr[N];
ll cl(int v) {
return (int)s[v].size() * 1ll * ((int)s[v].size() - 1);
}
ll d(int v) {
return (int)s[v].size() * 1ll * (int)t[v].size();
}
ll res = 0;
void merge(int v,int u) {
v = get(v);
u = get(u);
if(v == u) return;
res -= cl(v);
res -= cl(u);
res -= d(v);
res -= d(u);
p[v] = u;
for(int i:s[v]) {
s[u].insert(i);
t[u].erase(i);
}
for(int i:t[v]) {
if(s[u].find(i) != s[u].end()) {
t[u].erase(i);
} else {
t[u].insert(i);
}
}
g[u].erase(v);
g[v].erase(u);
vector<pair<int,int>> mrg;
for(int i:g[v]) {
if(g[i].count(u)) {
mrg.push_back({i,u});
}
g[u].insert(i);
}
gr[v].erase(u);
gr[u].erase(v);
for(int i:gr[v]) {
if(g[u].count(i)) {
mrg.push_back({i,u});
}
gr[u].insert(i);
}
res += cl(u);
res += d(u);
for(auto [x,y]:mrg) {
merge(x,y);
}
}
void test() {
cin >> n >> m;
for(int i = 1;i <= n;i++) {
p[i] = i;
s[i].insert(i);
}
while(m--) {
int a,b;
cin >> a >> b;
int A = get(a),B = get(b);
if(A == B || t[B].count(a)) {
cout << res << '\n';
continue;
}
if(g[B].count(A)) {
merge(A,B);
} else {
g[A].insert(B);
gr[B].insert(A);
t[B].insert(a);
res += (int)s[B].size();
}
cout << res << '\n';
}
}
int main() {
ios_base::sync_with_stdio(false);cin.tie(0);
int t = 1;
// cin >> t;
while(t--) {
test();
}
}
Details
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Subtask #1:
score: 0
Wrong Answer
Test #1:
score: 1
Accepted
time: 0ms
memory: 22372kb
input:
5 20 4 2 1 5 2 3 2 5 3 2 3 1 4 5 1 2 5 2 1 4 4 1 3 4 5 1 2 4 2 1 4 3 1 3 5 4 3 5 5 3
output:
1 2 3 4 6 7 8 12 16 20 20 20 20 20 20 20 20 20 20 20
result:
ok 20 lines
Test #2:
score: 0
Wrong Answer
time: 2ms
memory: 22288kb
input:
5 20 4 5 1 2 2 1 4 3 3 2 5 2 1 5 4 1 2 3 1 3 1 4 4 2 5 1 3 5 2 5 3 1 2 4 3 4 5 4 5 3
output:
1 2 3 4 6 8 13 13 14 15 20 20 20 20 20 20 20 20 20 20
result:
wrong answer 9th lines differ - expected: '16', found: '14'
Subtask #2:
score: 0
Skipped
Dependency #1:
0%
Subtask #3:
score: 0
Skipped
Dependency #1:
0%