Submission #646964

#	Time	Username	Problem	Language	Result	Execution time	Memory
646964		ksu2009en	Paths (RMI21_paths)	C++17	19 / 100	1088 ms	9084 KiB

Main

#pragma GCC optimize("O3")

#include <iostream>
#include <vector>
#include <string>
#include <math.h>
#include <cmath>
#include <iomanip>
#include <cstdio>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <deque>
#include <bitset>
#include <cstring>
#include <unordered_map>

#define endl '\n'

using namespace std;
typedef long long ll;

vector<vector< pair<pair<int, ll>, int> >>d;

ll mx = -1, pos = 0, local = 0;

void dfs(int v, int par, ll cost){
    if(cost > mx){
        mx = cost;
        pos = v;
    }
    
    for(auto i: d[v]){
        if(i.first.first != par){
            dfs(i.first.first, v, cost + (i.second != local ? i.first.second : 0));
        }
    }
}

bool dfs_2(int v, int par){
    if(v == pos)
        return true;
    
    for(auto &i: d[v]){
        if(i.first.first == par)
            continue;
        
        if(dfs_2(i.first.first, v)){
            i.second = local;
            return true;
        }
    }
    return false;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll n, k;
    cin >> n >> k;
    
    d.resize(n + 1);
    
    for(int i = 0; i < n - 1; i++){
        ll x, y, c;
        cin >> x >> y >> c;
        
        d[x].push_back({{y, c}, 0});
        d[y].push_back({{x, c}, 0});
    }
    
    ll ans = 0;
    
    for(int root = 1; root <= n; root++){
        local = root;
        ans = 0;
        
        for(int step = 1; step <= k; step++){
            mx = -1, pos = 0;
            
            dfs(root, -1, 0);
            
            bool unused = dfs_2(root, -1);
            
            ans += mx;
        }
        cout << ans << endl;
    }
     
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:86:18: warning: unused variable 'unused' [-Wunused-variable]
   86 |             bool unused = dfs_2(root, -1);
      |                  ^~~~~~

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