Submission #1164504

#	Time	Username	Problem	Language	Result	Execution time	Memory
1164504		antonn	Reconstruction Project (JOI22_reconstruction)	C++20	3 / 100	5095 ms	22076 KiB

reconstruction

#include <bits/stdc++.h>

#define F first
#define S second
 
using namespace std;
using ll = long long;
using pi = pair<int, int>;
using vi = vector<int>;
 
template<class T> bool ckmin(T& a, T b) { return b < a ? a = b, true : false; }
template<class T> bool ckmax(T& a, T b) { return a < b ? a = b, true : false; }

const int N = 5e2 + 7;

int n, m, t[N], sz[N];

vector<array<int, 4>> edges;

int root(int x) {
    if (t[x] == x) return x;
    return t[x] = root(t[x]);
}

void join(int a, int b) {
    a = root(a), b = root(b);
    if (a == b) return;
    if (sz[a] < sz[b]) swap(a, b);
    sz[a] += sz[b];
    t[b] = a;
}

vector<int> get_config(int x) {
    sort(edges.begin(), edges.end(), [&](array<int, 4> a, array<int, 4> b) { return abs(x - a[2]) < abs(x - b[2]); });
    
    for (int i = 1; i <= n; ++i) t[i] = i, sz[i] = 1;
    vector<int> sol;
    for (auto [a, b, w, i] : edges) {
        if (root(a) != root(b)) {
            join(a, b);
            sol.push_back(i);
        }
    }
    return sol;
}

int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    
    cin >> n >> m;
    vector<int> weight(m + 1);
    for (int i = 1; i <= m; ++i) {
        int a, b, w; cin >> a >> b >> w;
        edges.push_back({a, b, w, i});
        weight[i] = w;
    }
    int q; cin >> q;
    vector<ll> ans(q + 1), x(q + 1); vector<int> ord;
    for (int i = 1; i <= q; ++i) {
        cin >> x[i];
        ord.push_back(i);
    }
    sort(ord.begin(), ord.end(), [&](int i, int j) { return x[i] < x[j]; });
    
    vector<pair<pi, vector<int>>> intervals;
    int l = 1, ptr = 0;
    while (true) {
        vector<int> config = get_config(l);
        int low = l + 1, high = 1e9, sol = l;
        while (low <= high) {
            int mid = (low + high) / 2;
            if (get_config(mid) == config) {
                sol = mid;
                low = mid + 1;
            } else {
                high = mid - 1;
            }
        }
        
        while (ptr < q && x[ord[ptr]] <= sol) {
            ll cost = 0;
            for (auto id : config) cost += abs(x[ord[ptr]] - weight[id]);
            ans[ord[ptr]] = cost;
            ++ptr;
        }
        l = sol + 1;
        if (sol == 1e9) break;
    }
    for (int i = 1; i <= q; ++i) cout << ans[i] << "\n";
}

• Subtask 1: 3 / 3
• Subtask 2: 0 / 4
• Subtask 3: 0 / 7
• Subtask 4: 0 / 28
• Subtask 5: 0 / 35
• Subtask 6: 0 / 23