제출 #398261

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
398261		JerryLiu06	Race (IOI11_race)	C++11	100 / 100	529 ms	35204 KiB

race

#include <bits/stdc++.h>
#include"race.h"

using namespace std;

using ll = long long;
using db = long double;
using str = string;

using pi = pair<int, int>;
using pl = pair<ll, ll>;
using pd = pair<db, db>;

using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>;
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vpd = vector<pd>;

#define mp make_pair
#define f first
#define s second

#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define sor(x) sort(all(x))
#define ft front()
#define bk back()
#define pb push_back
#define pf push_front

#define lb lower_bound
#define ub upper_bound

#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 EACH(a, x) for (auto& a : x)

const int MOD = 1e9 + 7;
const int MX = 2e5 + 10;
const ll INF = 1e18;

int N, K, timer, ans = MOD; vpi adj[MX]; int sub[MX]; bool vis[MX]; pi cur[1000010];

void DFS1(int X, int P) { 
    sub[X] = 1; EACH(Y, adj[X]) if (Y.f != P && !vis[Y.f]) { DFS1(Y.f, X); sub[X] += sub[Y.f]; } 
}
int getCent(int X, int P, int S) { 
    EACH(Y, adj[X]) if (Y.f != P && !vis[Y.f] && sub[Y.f] > S / 2) return getCent(Y.f, X, S); return X;
}
void DFS2(int X, int P, bool upd, int dist, int depth) {
    if (dist > K) return ; 
    
    if (upd) { if (cur[dist].f == timer) cur[dist].s = min(cur[dist].s, depth); else cur[dist] = {timer, depth}; }
    else { if (cur[K - dist].f == timer) ans = min(ans, cur[K - dist].s + depth); }

    EACH(Y, adj[X]) if (Y.f != P && !vis[Y.f]) DFS2(Y.f, X, upd, dist + Y.s, depth + 1);
}
void decomp(int X) {
    DFS1(X, -1); int C = getCent(X, -1, sub[X]); vis[C] = true; cur[0] = {++timer, 0};

    EACH(Y, adj[C]) if (!vis[Y.f]) { DFS2(Y.f, C, false, Y.s, 1); DFS2(Y.f, C, true, Y.s, 1); }

    EACH(Y, adj[C]) if (!vis[Y.f]) decomp(Y.f);
}
int best_path(int _N, int _K, int H[][2], int L[]) {
    N = _N; K = _K; F0R(i, N - 1) { 
        int A = H[i][0]; int B = H[i][1]; 
        
        adj[A].pb({B, L[i]}), adj[B].pb({A, L[i]});
    }
    decomp(0); return (ans == MOD ? -1 : ans);
}

컴파일 시 표준 에러 (stderr) 메시지

race.cpp: In function 'int getCent(int, int, int)':
race.cpp:42:20: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   42 | #define EACH(a, x) for (auto& a : x)
      |                    ^~~
race.cpp:54:5: note: in expansion of macro 'EACH'
   54 |     EACH(Y, adj[X]) if (Y.f != P && !vis[Y.f] && sub[Y.f] > S / 2) return getCent(Y.f, X, S); return X;
      |     ^~~~
race.cpp:54:95: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   54 |     EACH(Y, adj[X]) if (Y.f != P && !vis[Y.f] && sub[Y.f] > S / 2) return getCent(Y.f, X, S); return X;
      |                                                                                               ^~~~~~

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