Submission #974456

#	Time	Username	Problem	Language	Result	Execution time	Memory
974456		saayan007	Race (IOI11_race)	C++17	21 / 100	26 ms	9288 KiB

race

#include "race.h"
#include "bits/stdc++.h"
using namespace std;

#define rep(i, a, b) for(int i = (a); i <= (b); ++i)
#define repd(i, a, b) for(int i = (a); i >= (b); --i)

#define em emplace
#define eb emplace_back

const int M = 1010;
vector<pair<int, int>> adj[M];

int dfs(int x, int p, int rem, int len) {
    if(rem == 0) return len;
    if(rem < 0) return M;

    int ans = M;
    for(auto [y, w] : adj[x]) {
        if(y == p) continue;
        ans = min(ans, dfs(y, x, rem - w, len + 1));
    }
    return ans;
}

int best_path(int N, int K, int H[][2], int L[])
{
    rep(i, 0, N - 2) {
        adj[H[i][0] + 1].eb(H[i][1] + 1, L[i]);
        adj[H[i][1] + 1].eb(H[i][0] + 1, L[i]);
    }

    int ans = N;
    rep(i, 1, N) {
        ans = min(ans, dfs(i, 0, K, 0));
    }
    return (ans >= N ? -1 : ans);
}

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 0 / 22
• Subtask 4: 0 / 57