Submission #851126

#	Time	Username	Problem	Language	Result	Execution time	Memory
851126		Itamar	Paths (RMI21_paths)	C++14	56 / 100	599 ms	3668 KiB

Main

// greedy cat.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
using namespace std;
#include <vector>
#define ll long long
#define pll pair<ll,ll>
#define vll vector<ll>
#include <queue>
const int siz = 2000;
vector<pll> fr[siz];
ll ans[siz];
int N,K;
#include <algorithm>
#include <set>
pll dfs(int i, vector<pll>&pad,vector<vll>&vec) {
    pll ansi={0,i};
    for (pll j: fr[i]) {
        if (j.first != pad[i].first) {
            pad[j.first] = { i,j.second };
            pll k =dfs(j.first, pad, vec);
            //s.insert({ -k.first - j.second,k.second });
            vec.push_back({ -k.first - j.second,k.second,i });
            ansi = max(ansi, { k.first + j.second,k.second });

        }
    }
    return ansi;
}
bool visi[siz][siz];
void calc(int r) {
    //vector<vector<bool>> visi(N, vector<bool>(N));
    set<pll> s;
    vector<vll> vec;
    vector<pll> pad(N,{-1,-1});
    dfs(r,pad,vec);
    sort(vec.begin(), vec.end());
    //for (pll p : vec)s.insert(p);
    vector<bool> vis(N);
    vis[r] = 1;
    int it = 0;
    vector<pll> cl;
    for (int i = 0; i < K; i++) {
        if (it == vec.size())break;
        while (visi[vec[it][1]][vec[it][2]]){ 
            it++;
            if (it == vec.size())break;
        }
        if (it == vec.size())break;
        //visi[vec[it][1]][vec[it][2]] = 1;
        //vis[vec[it][2]] = 1;
        vll v = vec[it];
        ans[r] -= v[0];
        ll cur = 0;
        int x = v[1];
        while (!vis[x]) {
            cur += pad[x].second;
            vis[x] = 1;
            visi[v[1]][pad[x].first] = 1;
            cl.push_back({ v[1],pad[x].first });
            x = pad[x].first;
            //if (x == r)break;else x = pad[x].first;
        }
    }
    for (pll p : cl)visi[p.first][p.second] = 0;
}

int main()
{
    int n,k;
    cin >> n >> k;
    N = n, K =k;
    for (int i = 0; i < n - 1; i++) {
        int x, y, c;
        cin >> x >> y >> c;
        x--, y--;
        fr[x].push_back({ y,c });
        fr[y].push_back({ x,c });
    }
    for(int r = 0; r < n; r++)calc(r);
    for (int i = 0; i < n; i++)cout << ans[i] << "\n";
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file

Compilation message (stderr)

Main.cpp: In function 'void calc(int)':
Main.cpp:45:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         if (it == vec.size())break;
      |             ~~~^~~~~~~~~~~~~
Main.cpp:48:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |             if (it == vec.size())break;
      |                 ~~~^~~~~~~~~~~~~
Main.cpp:50:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         if (it == vec.size())break;
      |             ~~~^~~~~~~~~~~~~

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