#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
void setIO(string s) {
freopen((s + ".in").c_str(), "r", stdin);
freopen((s + ".out").c_str(), "w", stdout);
}
#ifdef local
void CHECK();
void setio(){
freopen("/Users/iantsai/cpp/input.txt","r",stdin);
freopen("/Users/iantsai/cpp/output.txt","w",stdout);
}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
#define TOI_is_so_de ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);setio();
const int mxn = 1e5+5;
int n, m, ans;
struct DSU{
int to[mxn];
set<int>g[mxn], out[mxn], in[mxn];
void init(){
for(int i=1;i<=n;i++){
g[i].insert(i);
to[i] = i;
}
}
int find(int x){
return x==to[x]?x:to[x]=find(to[x]);
}
void merge(int x,int y){
x=find(x);
y=find(y);
if(x == y){
return;
}
if(sz(g[x]) > sz(g[y])){
swap(x, y);
}
if(sz(out[x]) > sz(out[y])){
swap(out[x], out[y]);
}
if(sz(in[x]) > sz(in[y])){
swap(in[x], in[y]);
}
for(auto i:out[x]){
out[y].insert(i);
}
out[x].clear();
int cnt = sz(in[y]);
for(auto i:in[x]){
if(in[y].find(i)==in[y].end()){
//ans += sz(g[y]);
}
else{
cnt--;
}
in[y].insert(i);
}
//ans += cnt*sz(g[x]);
for(auto i:g[x]){
g[y].insert(i);
}
g[x].clear();
in[x].clear();
to[x] = y;
for(auto i:g[y]){
in[y].erase(i);
out[y].erase(i);
}
}
void cal(int x, int y){
int px = find(x), py = find(y);
if(px != py){
//ans += sz(g[py]);
}
else{
return;
}
out[px].insert(py);
in[py].insert(px);
if(out[py].find(px) != out[py].end()){
merge(px, py);
}
if(in[px].find(py) != in[px].end()){
//merge(x, y);
}
ans = 0;
for(int i=1;i<=n;i++){
ans += sz(in[i])*sz(g[i]) + sz(g[i])*(sz(g[i])-1);
}
}
}d;
signed main(){
TOI_is_so_de;
cin >> n >> m;
d.init();
for(int i=0;i<m;i++){
int x, y;
cin >> x >> y;
d.cal(x, y);
cout << ans << '\n';
}
#ifdef local
CHECK();
#endif
}
/*
input:
*/
#ifdef local
void CHECK(){
cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
function<bool(string,string)> compareFiles = [](string p1, string p2)->bool {
std::ifstream file1(p1);
std::ifstream file2(p2);
if (!file1.is_open() || !file2.is_open())return false;
std::string line1, line2;
while (getline(file1, line1) && getline(file2, line2)) {
if (line1 != line2)return false;
}
int cnta=0,cntb=0;
while(getline(file1,line1))cnta++;
while(getline(file2,line2))cntb++;
return cntb-cnta<=1;
};
bool check = compareFiles("output.txt","expected.txt");
if (check) cerr<<"ACCEPTED\n";
else cerr<<"WRONG ANSWER!\n";
}
#else
#endif
Compilation message
joitter2.cpp: In function 'void setIO(std::string)':
joitter2.cpp:35:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
35 | freopen((s + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joitter2.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
36 | freopen((s + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
14936 KB |
Output is correct |
| 2 |
Correct |
2 ms |
14940 KB |
Output is correct |
| 3 |
Incorrect |
2 ms |
15044 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
14936 KB |
Output is correct |
| 2 |
Correct |
2 ms |
14940 KB |
Output is correct |
| 3 |
Incorrect |
2 ms |
15044 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
14936 KB |
Output is correct |
| 2 |
Correct |
2 ms |
14940 KB |
Output is correct |
| 3 |
Incorrect |
2 ms |
15044 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
