Submission #719306

#	Time	Username	Problem	Language	Result	Execution time	Memory
719306		Joshi503	Race (IOI11_race)	C++14	21 / 100	3082 ms	9052 KiB

race

// #include "race.h"
#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
// #define int ll
using db = long double;
using str = string;
using pi = pair<int, int>;
using pl = pair<ll, ll>;
using pd = pair<db, db>;
#define f first
#define s second
 
#define tcT template<class T
#define tcTU tcT, class U
tcT> using V = vector<T>;
tcT, size_t SZ > using AR = array<T, SZ>;
using vi = V<int>;
using vb = V<bool>;
using vl = V<ll>;
using vd = V<db>;
using vs = V<str>;
using vpi = V<pi>;
using vpl = V<pl>;
 
#define sz(x) ll((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sor(x) sort(all(x)) 
#define pb push_back
#define yes cout << "Y" << "e" << "s\n";
#define no cout << "N" << "o\n";
 
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = ((b)-1); i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)
 
const int MOD = 998244353;
const int MOD98 = 998244353;
const int MX = 1e9;
// const int INF = 1e18;
const db PI = acos((db)-1);
// const int dx[] = { 1,0,-1,0 };
// const int dy[] = { 0,1,0,-1 };
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());
template<class T> using pqg = priority_queue<T, vector<T>, greater<T>>;
void setIO(string name = "") {
    ios_base::sync_with_stdio(0); cin.tie(0);
    if ((ll)(name.size())) {
        freopen((name + ".in").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
}
template<class T> bool ckmin(T& a, const T& b) {
    return b < a ? a = b, 1 : 0; 
} 
template<class T> bool ckmax(T& a, const T& b) {
    return a < b ? a = b, 1 : 0; 
}
void _print(char i) { cerr << i; }
void _print(string i) { cerr << i; }
void _print(float i) { cerr << i; }
void _print(int i) { cerr << i; }
void _print(double i) { cerr << i; }
void _print() { cerr << "\n"; };
template<typename x, typename y> void _print(pair<x, y>& t) { cerr << "{";_print(t.first);cerr << ", ";_print(t.second);cerr << "},"; }
template<typename x> void _print(x& t) { cerr << "{"; for (int i = 0;i < (int)t.size();i++) { _print(t[i]); if (i < (int)t.size() - 1) cerr << ", "; } cerr << "}"; }
template<typename x, typename... y> void _print(x a, y... b) { _print(a);if (sizeof...(b)) cerr << ", ";_print(b...); }
#define dbg(x...) cerr<<"["<<#x<<"] = [";_print(x);cerr<<"]\n";
int test;

/*



*/
int n, k;
vector<ll> d;
vector<vpi> adj;
int mini;
void dfs(int u, int p, int len = 1){
    each(v, adj[u]){
        if(v.f == p) continue;
        d[v.f] = d[u] + v.s;
        if(d[v.f] == k){
            mini = min(mini, len);
        }
        dfs(v.f, u, len + 1);
    }
}

int best_path(int N, int K, int H[][2], int L[]){
    adj = vector<vpi>(N + 1);
    n = N, k = K;
    F0R(i, N - 1){
        int u = H[i][0], v = H[i][1];
        adj[u].pb({v, L[i]});
        adj[v].pb({u, L[i]});
    }
    int ans = 1000000;
    F0R(i, N){
        mini = 1000000;
        d = vector<ll>(N + 1, 0);
        dfs(i, -1);
        ans = min(mini, ans);
    }
    if(ans == 1000000) return -1;
    return ans;
}
// signed main() {
//     setIO("");
//     int T = 1;
//     // cin >> T;
//     for (test = 1; test <= T; test++) {
//         // cout << "Case #" << test << ": " << a.f << " " << a.s << "\n";
//         // solve();
//         int N, K; cin >> N >> K; 
//         int H[N][2], L[N];
//         F0R(i, N - 1) cin >> H[i][0] >> H[i][1];
//         F0R(i, N) cin >> L[i];
//         cout << best_path(N, K, H, L);
//     }
// }

Compilation message (stderr)

race.cpp: In function 'void setIO(std::string)':
race.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
race.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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