//#pragma GCC optimize("Ofast,O3")
//#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "debugger.cpp"
#else
#define debug(...)
#endif
template<class T>
int len(T &a){
return a.size();
}
using ll = long long;
using pii = pair<int,int>;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
string fileio = "";
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const int MOD = 1e9 + 7;
const int inf = 1e9;
const ll infl = 1e18;
const int maxn = 1e5 + 1;
struct DSU{
vector<int> par, sz; int n;
DSU (int _n){
n = _n;
par.resize(n);
iota(all(par), 0);
sz.assign(n, 1);
}
DSU (){}
int get(int a){
return (par[a] == a ? a : par[a] = get(par[a]));
}
void init(int _n){
n = _n;
par.resize(n);
iota(all(par), 0);
sz.assign(n, 1);
}
void unite(int a, int b){
a = get(a);
b = get(b);
if(a == b) return;
if(sz[a] < sz[b]) swap(a,b);
sz[a] += sz[b];
par[b] = a;
}
void link(int a, int b){
a = get(a); b = get(b);
if(a == b) return;
sz[b] += sz[a];
par[a] = b;
}
};
void solve(){
int n, m; cin >> n >> m;
// #ifdef LOCAL
// m = 1000;
// n = 100;
// #endif
ll ans = 0;
vector<set<int>> half(n);
map<pair<int,int>, vector<int>> lead;
DSU t(n);
while(m --){
#ifdef LOCAL
cout << endl;
#endif
int a, b; cin >> a >> b; a --; b --;
int lb = t.get(b), la = t.get(a);
//lb<->la == true
if(la == lb){
debug(1);
cout << ans << '\n';
continue;
}
//not b->a
if(lead.count({la, lb}) == 0){
// yes a->b
if(half[lb].count(a)){
debug(2);
cout << ans << '\n';
continue;
}
// no a->b
lead[{lb, la}].push_back(a);
ans += t.sz[lb];
half[lb].insert(a);
debug(3);
cout << ans << '\n';
continue;
}
// lb->la == true
ans -= 1ll * t.sz[la] * len(lead[{la, lb}]);
for(auto u : lead[{la, lb}]) half[la].erase(u);
lead[{la, lb}].clear();
debug(ans);
ans += 2ll * t.sz[la] * t.sz[lb];
ans += len(half[lb]) * t.sz[la];
ans += len(half[la]) * t.sz[lb];
debug(ans);
if(len(half[la]) > len(half[lb])){
swap(la, lb);
}
for(auto u : half[la]){
int lu = t.get(u);
half[lb].insert(u);
lead[{lb, lu}].push_back(u);
lead[{la, lu}].clear();
}
half[la].clear();
t.link(la, lb);
debug(4);
cout << ans << '\n';
}
}
int main(){
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
auto start = chrono::high_resolution_clock::now();
#ifndef LOCAL
if(fileio.size()){
freopen((fileio + ".in").c_str(), "r", stdin);
freopen((fileio + ".out").c_str(), "w", stdout);
}
#endif
int testcases = 1;
#ifdef Tests
cin >> testcases;
#endif
while(testcases --){
solve();
if(testcases) cout << '\n';
#ifdef LOCAL
else cout << '\n';
cout << "_________________________" << endl;
#endif
}
#ifdef LOCAL
auto duration = chrono::duration_cast<chrono::microseconds>(chrono::high_resolution_clock::now() - start);
cout << "time: " << (double)duration.count()/1000.0 << " milliseconds" << endl;
#endif
return 0;
}
Compilation message
joitter2.cpp: In function 'int main()':
joitter2.cpp:148:10: warning: variable 'start' set but not used [-Wunused-but-set-variable]
148 | auto start = chrono::high_resolution_clock::now();
| ^~~~~
joitter2.cpp:151:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
151 | freopen((fileio + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joitter2.cpp:152:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
152 | freopen((fileio + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
