Submission #691438

#	Time	Username	Problem	Language	Result	Execution time	Memory
691438		saayan007	Race (IOI11_race)	C++17	21 / 100	3055 ms	12620 KiB

race

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

using ll = long long;
using pi = pair<int, int>;
using pl = pair<long long, long long>;
using vi = vector<int>;
using vl = vector<long long>;
using vpi = vector<pair<int, int>>;
using vpl = vector<pair<long long, long long>>;

#define fur(i, a, b) for(ll i = a; i <= (ll)b; ++i)
#define ruf(i, a, b) for(ll i = a; i >= (ll)b; --i)
#define fr first 
#define sc second
#define mp make_pair
#define pb emplace_back
#define nl "\n"
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

const ll mxn = 2e5L + 1;
vpl adj[mxn];

int dfs(ll cur, ll src, ll len, ll num, ll need) {
    if(len == need) {
        return num;
    } else if(len > need) {
        return mxn;
    }

    int ans = mxn;
    for(auto [ch, wt] : adj[cur]) {
        if(ch != src) {
            ans = min(ans, dfs(ch, cur, len + wt, num + 1, need));
        }
    }
    return ans;
} 

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

    int ans = N;
    fur(i, 1, N) {
        ans = min(ans, dfs(i, -1, 0, 0, K));
    }
    if(ans == N)
        ans = -1;
    return ans;
}

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