Submission #416375

#	Time	Username	Problem	Language	Result	Execution time	Memory
416375		model_code	Rooted MST (innopolis2021_final_E)	C++17	10 / 100	4102 ms	23716 KiB

Main

#include <cmath>
#include <functional>
#include <fstream>
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <set>
#include <map>
#include <list>
#include <time.h>
#include <math.h>
#include <random>
#include <deque>
#include <queue>
#include <cassert>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include <bitset>
#include <sstream>
#include <chrono>
#include <cstring>

using namespace std;

typedef long long ll;

#ifdef iq
  mt19937 rnd(228);
#else
  mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
#endif

const int N = 3e5 + 20;

int dsu[N];

int get(int v) {
  if (v == dsu[v]) return v;
  else return dsu[v] = get(dsu[v]);
}

void uni(int u, int v) {
  dsu[get(u)] = get(v);
}

int main() {
#ifdef iq
  freopen("a.in", "r", stdin);
#endif
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector <int> a(n + 1);
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  vector <pair <int, pair <int, int> > > e;
  for (int i = 0; i < m; i++) {
    int u, v, w;
    cin >> u >> v >> w;
    e.push_back({w, {u, v}});
  }
  auto solve = [&] () {
    auto f = e;
    for (int i = 1; i <= n; i++) {
      f.push_back({a[i], {0, i}});
    }
    sort(f.begin(), f.end());
    for (int i = 0; i <= n; i++) dsu[i] = i;
    ll sum = 0;
    for (auto c : f) {
      auto t = c.second;
      if (get(t.first) != get(t.second)) {
        sum += c.first;
        uni(t.first, t.second);
      }
    }
    return sum;
  };
  int q;
  cin >> q;
  while (q--) {
    int i, w;
    cin >> i >> w;
    a[i] = w;
    cout << solve() << '\n';
  }
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 20
• Subtask 8: 0 / 20