Submission #1331328

#	Time	Username	Problem	Language	Result	Execution time	Memory
1331328		back	Race (IOI11_race)	C++20	Compilation error	0 ms	0 KiB

race

#include "race.h"
#include<bits/stdc++.h>
#define int long long
#define pii pair<int, int>
#define se second
#define fi first

using namespace std;
const int N1 = 2e5 + 5;
const int MAXN = LLONG_MAX;
const int mod = 1e9 + 7;
int n, k;
int sum[N1], ds[N1];
int ans=MAXN;
pii a[N1];
map <int, int> dp[N1];
vector<vector <pii>> adj;
//int K, H[N1][2], L[N1], N;

void dfs(int u, int p) {
    dp[u][sum[u]]=ds[u];
    
    for (auto &i: adj[u]) {
        if (i.fi==p) continue;
        sum[i.fi]=sum[u]+i.se;
        ds[i.fi]=ds[u]+1;
        int v;
        dfs(v=i.fi, u);
    
        if (dp[u].size() < dp[v].size()) swap(dp[u], dp[v]);

        for (auto &j: dp[v]) {
            if (dp[u].find(k+sum[u]*2-j.fi)!=end(dp[u])) {
                ans=min(ans, dp[u][k+sum[u]*2-j.fi]+j.se-ds[u]*2);
            }
        }
        for (auto &j: dp[v]) {
            if (dp[u].find(j.fi)==end(dp[u])) {
                dp[u][j.fi]=j.se;
            }
            else dp[u][j.fi]=min(dp[u][j.fi], j.se);
        }
        dp[v].clear();
    }

}

int best_path(int N, int K, int H[][2], int L[]) {
    n=N;
    adj.resize(n);
    
    for (int i=0; i<n-1; ++i) {
        adj[H[i][0]].push_back({H[i][1], L[i]});
        adj[H[i][1]].push_back({H[i][0], L[i]});
    }
    k=K;
    dfs(0, 0);
    if (ans==MAXN) return -1;
    else return ans;
}

/*signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    cin >> N >> K;
    for (int i=0; i<N-1; ++i) {
        cin >> H[i][0] >> H[i][1] >> L[i];
    }
    cout << best_path(N, K, H, L);
}*/

Compilation message (stderr)

/usr/bin/ld: /tmp/cclTQ3AE.o: in function `main':
grader.cpp:(.text.startup+0x28): undefined reference to `best_path(int, int, int (*) [2], int*)'
collect2: error: ld returned 1 exit status