Submission #1236025

#	Time	Username	Problem	Language	Result	Execution time	Memory
1236025		htoshiro	Race (IOI11_race)	C++20	Compilation error	0 ms	0 KiB

race

#include <bits/stdc++.h>
#define int long long
#pragma GCC optimize("Ofast,unroll-loops")
using namespace std;
int best_path(int N, int K, int H[][2], int L[]){
    n = N;
    k = K;
    adj.resize(n);
    sz.resize(n);
    nxt.resize(n);
    blocked.assign(N, false);
    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]});
    }
    ans = build(0, -1);
    return (ans == LLONG_MAX ? -1 : ans);
}
struct pi {
    int x, y;
};
vector<vector<pi>> adj;
vector<int> sz;
vector<bool> blocked;
vector<int> nxt;
int n, k;
int ans;
int dfs(int cur, int par) {
    sz[cur] = 1;
    for (auto &a : adj[cur]) {
        if (a.x != par && !blocked[a.x]) {
            sz[cur] += dfs(a.x, cur);
        }
    }
    return sz[cur];
}
int cent(int cur, int par, int am) {
    for (auto &a : adj[cur]) {
        if (a.x != par && !blocked[a.x] && sz[a.x] > am / 2) {
            return cent(a.x, cur, am);
        }
    }
    return cur;
}
void dfs2(int cur, int par, int dist, int depth, vector<pair<int, int>> &paths) {
    if (dist > k) return;
    paths.emplace_back(dist, depth);
    for (auto &a : adj[cur]) {
        if (a.x != par && !blocked[a.x]) {
            dfs2(a.x, cur, dist + a.y, depth + 1, paths);
        }
    }
}
int build(int cur, int par) {
    int total = dfs(cur, -1);
    int curc = cent(cur, -1, total);
    blocked[curc] = true;
    nxt[curc] = par;
    unordered_map<int, int> dist_count;
    dist_count[0] = 0; 
    int best = LLONG_MAX;
    for (auto &a : adj[curc]) {
        if (!blocked[a.x]) {
            vector<pair<int, int>> paths;
            dfs2(a.x, curc, a.y, 1, paths);
            for (auto &[d, l] : paths) {
                if (dist_count.count(k - d)) {
                    best = min(best, l + dist_count[k - d]);
                }
            }
            for (auto &[d, l] : paths) {
                if (!dist_count.count(d)) dist_count[d] = l;
                else dist_count[d] = min(dist_count[d], l);
            }
        }
    }
    for (auto &a : adj[curc]) {
        if (!blocked[a.x]) {
            best = min(best, build(a.x, curc));
        }
    }
    return best;
}

Compilation message (stderr)

race.cpp: In function 'long long int best_path(long long int, long long int, long long int (*)[2], long long int*)':
race.cpp:6:5: error: 'n' was not declared in this scope
    6 |     n = N;
      |     ^
race.cpp:7:5: error: 'k' was not declared in this scope
    7 |     k = K;
      |     ^
race.cpp:8:5: error: 'adj' was not declared in this scope
    8 |     adj.resize(n);
      |     ^~~
race.cpp:9:5: error: 'sz' was not declared in this scope
    9 |     sz.resize(n);
      |     ^~
race.cpp:10:5: error: 'nxt' was not declared in this scope
   10 |     nxt.resize(n);
      |     ^~~
race.cpp:11:5: error: 'blocked' was not declared in this scope; did you mean 'lockf'?
   11 |     blocked.assign(N, false);
      |     ^~~~~~~
      |     lockf
race.cpp:16:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   16 |     ans = build(0, -1);
      |     ^~~
      |     abs
race.cpp:16:11: error: 'build' was not declared in this scope
   16 |     ans = build(0, -1);
      |           ^~~~~