Submission #1108695

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108695		_fractal	Paths (RMI21_paths)	C++14	19 / 100	1041 ms	37204 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define F first
#define S second 
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define make_unique(x) sort(all(x)), x.erase(unique(all(x)), x.end())

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 Rng(chrono::steady_clock::now().time_since_epoch().count());

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;

const int N = 1e6 + 200;
const int M = 1e6;
const int inf = 2e9 + 3;
const ll INF = 1e18;

int n, k;
vector<pair<int, int>> g[N];
int cw[N];
long long cost[N];
int anc[N];
int r;

void dfs(int v = r, int p = 0, long long W = 0, int last = 0) {
    anc[v] = p;
    cw[v] = last;
    cost[v] = W;
    for (auto [to, w] : g[v]) {
        if (to == p) continue;
        dfs(to, v, W + w, w);
    }
}

void redfs(int v = r, int p = 0) {
    for (auto [to, w] : g[v]) {
        if (to == p) continue;
        cost[to] = cost[v] + cw[to];
        redfs(to, v);
    }
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> k;
    for (int i = 1, v, u, c; i < n; ++i) {
        cin >> v >> u >> c;
        g[v].emplace_back(u, c);
        g[u].emplace_back(v, c);
    }
    for (r = 1; r <= n; ++r) {
        for (int i = 1; i <= n; ++i) {
            cost[i] = cw[i] = anc[i] = 0;
        }
        dfs();
        long long ans = 0;
        for (int T = 1; T <= k; ++T) {
            int mx = 0;
            for (int i = 1; i <= n; ++i) {
                if (cost[i] > cost[mx])
                    mx = i;
            }
            ans += cost[mx];
            while (mx) {
                cw[mx] = 0;
                mx = anc[mx];
            }
            redfs();
        }
        cout << ans << '\n';
    }
}

Compilation message (stderr)

Main.cpp: In function 'void dfs(int, int, long long int, int)':
Main.cpp:33:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   33 |     for (auto [to, w] : g[v]) {
      |               ^
Main.cpp: In function 'void redfs(int, int)':
Main.cpp:40:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   40 |     for (auto [to, w] : g[v]) {
      |               ^

• Subtask 1: 8 / 8
• Subtask 2: 11 / 11
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 12
• Subtask 6: 0 / 32