Submission #1038066

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038066		karok	Race (IOI11_race)	C++17	Compilation error	0 ms	0 KiB

race

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

#define int long long

struct Edges {
    int target, weight;
};
struct Node {
    int value = INT_MAX;
};

const int MAXN = 200000 + 200;
const int MAXK = 1000000 + 200;

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, map<int,Node> &past_lengths, int parent = -1){
    int res = past_lengths[k - cur_length].value + 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[cur_length].value = min(past_lengths[cur_length].value, total_ans);
    return res;
}

int centroid_dfs(int cur_v) {
    int centroid = get_centroid(cur_v, get_tree_size(cur_v));
    int res;
    {
        map<int,Node> lengths;
        lengths[0].value = 0;
        res = min(dfs(centroid, 0, 0, lengths), 0ll + INT_MAX);
        // 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;
}

#undef int
int best_path(int a, int b, int h[][2] ,int l[] ) {
    n = a; k= b;
    for(int i =0;i < n - 1;i++) {
        adj[h[i][0]].push_back( Edges{h[i][1], l[i]} );
        adj[h[i][1]].push_back( Edges{h[i][0], l[i]} );
    }
    int ans = centroid_dfs(0);
    if(ans == INT_MAX) return -1;
    else return ans;
}
int main() {
    cin >> n >> k;
    for(int i =0;i < n - 1;i++) {
        int u, v, l;
        cin >> u >> v >> l;
        adj[u].push_back(Edges{v, l});
        adj[v].push_back(Edges{u, l});
    }
    int ans = centroid_dfs(0);
    if(ans == INT_MAX) cout << -1 << endl;
    else cout << ans << endl;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccefoMhN.o: in function `main':
race.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cciH2QsL.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status