Submission #1037965

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037965		karok	Race (IOI11_race)	C++17	Compilation error	0 ms	0 KiB

race

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

struct Edges {
    int target, weight;
};

const int MAXN = 200000;
const int MAXK = 1000000;

int n, k;
vector<vector<Edges>> adj(MAXN);
int tree_size[MAXN] = {};
bool is_removed[MAXN];

int get_tree_size(int cur_vertex, int parent = -1) {
    int &res = tree_size[cur_vertex];
    res = 1;
    for (auto [v, w] : adj[cur_vertex]) {
        if (v == parent || is_removed[v])continue;
            continue;
        res += get_tree_size(v, cur_vertex);
    }
    return res;
}

int get_centroid(int cur_vertex, int n, int parent = -1) {
    for (auto [v, w] : adj[cur_vertex]) {
        if (parent == v || is_removed[v])
            continue;
        if (tree_size[v] * 2 > n)
            return get_centroid(v, n, cur_vertex);
    }
    return cur_vertex;
}

int dfs(int cur_v,int cur_length, int total_ans, set<int> &past_lengths, int parent = -1){
    int res = INT_MAX;
    if(past_lengths.count(k - cur_length)) {
        return total_ans;
    }
    for(auto [v, w]: adj[cur_v]){
        if(v == parent || is_removed[v]) continue;
        res = min(dfs(v, w + cur_length, total_ans + 1, past_lengths, cur_v), res);
    }
    past_lengths.insert(cur_length);
    return res;
}

int centroid_dfs(int cur_v) {
    int centroid = get_centroid(cur_v, get_tree_size(cur_v));
    int res;
    {
        set<int> lengths{0};
        res = dfs(centroid, 0, 0, lengths);
    }
    is_removed[centroid] = true;
    for(auto [u, w]: adj[centroid]) {
        if(is_removed[u])continue;
        res = min(centroid_dfs(u), res);
    }
    return res;
}

int main() {
    cin >> n >> k;
    for (int i = 0; i < n - 1; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        adj[u].push_back(Edges{v, w});
        adj[v].push_back(Edges{u, w});
    }
    cout << centroid_dfs(0) << endl;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/cckJ96Mn.o: in function `main':
race.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cceBxTxr.o:grader.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cceBxTxr.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