Submission #7468798

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> l_l;
typedef pair<int, int> i_i;
typedef pair<ll, l_l> lll;
template<class T>
inline bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
inline bool chmin(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }
    return false;
}

#define EPS (1e-7)
#define INF (1e9)
#define PI (acos(-1))
const ll mod = 1000000007;
struct UnionFind {
    vector<int> par;
    vector<int> rank;
    vector<ll> Size;
    UnionFind(int n = 1) {
        init(n);
    }

    void init(int n = 1) {
        par.resize(n + 1); rank.resize(n + 1); Size.resize(n + 1);
        for (int i = 0; i <= n; ++i) par[i] = i, rank[i] = 0, Size[i] = 1;
    }

    int root(int x) {
        if (par[x] == x) {
            return x;
        }
        else {
            int r = root(par[x]);
            return par[x] = r;
        }
    }

    bool issame(int x, int y) {
        return root(x) == root(y);
    }

    bool merge(int x, int y) {
        x = root(x); y = root(y);
        if (x == y) return false;
        if (rank[x] < rank[y]) swap(x, y);
        if (rank[x] == rank[y]) ++rank[x];
        par[y] = x;
        Size[x] += Size[y];
        return true;
    }

    ll size(int x){
        return Size[root(x)];
    }
};

priority_queue<lll, vector<lll>, greater<lll>> que;

int main() {
    ll N, Q;
    cin >> N >> Q;
    UnionFind uni(N);
    while(Q--) {
        ll A, B, C;
        cin >> A >> B >> C;
        que.push({C, {A, B}});
        que.push({C+1, {(A+1)%N, B}});
    }
    ll ans = 0;
    while(uni.size(1) != N) {
        lll now = que.top();
        que.pop();
        ll a = now.second.first;
        ll b = now.second.second;
        ll c = now.first;
        if(uni.merge(a, b)) {
            ans += c;
            que.push({c+2, {(a+1)%N, (b+1)%N}});
        }
    }
    cout << ans << endl;
    return 0;
}

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