#pragma GCC optimization "O2"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")
#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 1e5 + 9;
const ll Log2 = 20;
const ll inf = 1e9 + 7;
typedef pair<ll,ll> LL;
ll n,m,x,y,lab[N],ans,in[N];
set<LL> inout[N];
ll Find(ll u){
if (lab[u] < 0) return u;
return lab[u] = Find(lab[u]);
}
void Union(ll r,ll s){
lab[r] += lab[s]; lab[s] = r;
}
ll cal(ll x){
return x*(x - 1);
}
bool Found(ll id,ll name,ll type){
return inout[id].find({name,type}) != inout[id].end();
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0), cout.tie(0);
#define task "tst"
if (fopen(task".inp", "r")){
freopen(task".inp", "r", stdin);
//freopen(task".out", "w", stdout);
}
cin>>n>>m; memset(lab,-1,sizeof(lab));
while(m--){
queue<ll> Q;
cin>>x>>y; x = Find(x); y = Find(y);
if (x == y){
cout<<ans<<"\n"; continue;
}
/// sc = 1 mean out sc = 0 mean in
ll par = x;
if (inout[x].find({y,0}) != inout[x].end()) Q.push(y);
else{
if (inout[y].find({x,0}) != inout[y].end()){
cout<<ans<<"\n"; continue;
}
inout[x].insert({y,1});
inout[y].insert({x,0}); in[y]++;
ans += -lab[y];
}
if (!m){
//cout<<x<<" "<<y; return 0;
}
while(!Q.empty()){
ll t = Q.front(); Q.pop(); t = Find(t);
if (Found(par,t,0)) inout[par].erase({t,0}),in[par]--;
inout[par].erase({t,1});
if (Found(t,par,0)) inout[t].erase({par,0}),in[t]--;
inout[t].erase({par,1});
ll sz1 = in[par],sz2 = in[t];
ans -= -lab[par]; ans -= cal(-lab[par]); ans -= cal(-lab[t]);
ans += cal(-lab[t] + -lab[par]);
ans += sz2*-lab[par] + sz1*-lab[t];
if (!m){
//cout<<sz2<<"x"; return 0;
//cout<<ans<<"x"; return 0;
}
if (inout[par].size() < inout[t].size()) swap(par,t);
Union(par,t);
for (auto i : inout[t]){
if (Found(par,i.fs,1 - i.sc)){
//cout<<lab[1]<<"x"; return 0;
ans -= -lab[Find(i.fs)];
Q.push(i.fs); continue;
}
inout[par].insert(i);
}
inout[t].clear(); //cout<<ans; return 0;
}
cout<<ans<<"\n";
}
}
Compilation message
joitter2.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
1 | #pragma GCC optimization "O2"
|
joitter2.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
2 | #pragma GCC optimization "unroll-loop"
|
joitter2.cpp: In function 'int main()':
joitter2.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
41 | freopen(task".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
4 ms |
5324 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
4 ms |
5324 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
4 ms |
5324 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
