CSES Road Construction
// compile: make data
// run: ./data < data.in
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#ifdef LOCAL
#include <debug/codeforces.h>
#define debug(x...) _debug_print(#x, x);
#define Debug(x...) _debug_print_format(#x, x);
#else
#define debug(x...)
#define Debug(x...)
#endif
template<typename...Args> void print_(Args...args){((cout<<args<<" "),...)<<endl;}
#define rep(i,a,b) for(int i=(a);i<(int)(b);++i)
#define sz(v) ((int)(v).size())
#define print(...) print_(__VA_ARGS__);
#define FIND(a, x) ((find(a.begin(),a.end(),(x))!=a.end())?1:0)
#define cmin(x,...) x=min({(x), __VA_ARGS__})
#define cmax(x,...) x=max({(x), __VA_ARGS__})
#define INTMAX (int)(9223372036854775807)
#define INF (int)(1152921504606846976)
#define double long double
#define int long long
#define MAXN 200010
struct DSU {
vector<int> parent, rank, s;
DSU(int n) {
parent.resize(n);
rank.resize(n);
s.resize(n, 1);
rep(i, 0, n) parent[i] = i;
}
int find(int x) {
if (parent[x] != x) parent[x] = find(parent[x]);
return parent[x];
}
void unite(int x, int y) {
int rx = find(x), ry = find(y);
if (rx == ry) return;
if (rank[rx] < rank[ry]) parent[rx] = ry, s[ry] = s[rx] + s[ry];
else if (rank[rx] > rank[ry]) parent[ry] = rx, s[rx] = s[rx] + s[ry];
else parent[ry] = rx, ++rank[rx], s[rx] = s[rx] + s[ry];
}
int get_size(int x) {
return s[find(x)];
}
};
int32_t main() {
ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
int n, q; cin >> n >> q;
DSU dsu(n);
int total = n, maxsize = 1;
while (q--) {
int u, v; cin >> u >> v; --u, --v;
if (dsu.find(u) != dsu.find(v)) {
dsu.unite(u, v);
--total, cmax(maxsize, dsu.get_size(u));
}
cout << total << " " << maxsize << endl;
}
return 0;
}
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Source: github.com/k4yt3x/flowerhd
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