Submission #393887

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
393887	2021-04-24 18:53:27	JerryLiu06	Railway (BOI17_railway)	C++11	100 / 100	102 ms	23320 KiB

railway

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#include <bits/stdc++.h>
using namespace std;
#define pb push_back
int N, M, K, timer = 1; vector<int> adj[100010];
int in[100010], out[100010], lift[100010][20];
int pref[100010], U[100010], V[100010];
void DFS(int X, int P) {
    in[X] = timer++; lift[X][0] = P;
    for (int NXT : adj[X]) if (NXT != P) { DFS(NXT, X); } out[X] = timer - 1;
}
bool isAnc(int A, int B) { return in[A] <= in[B] && out[A] >= out[B]; }
int getLCA(int A, int B) {
    if (isAnc(A, B)) return A; if (isAnc(B, A)) return B;
    for (int i = 19; i >= 0; i--) {
        if (lift[A][i] && !isAnc(lift[A][i], B)) A = lift[A][i];
    }
    return lift[A][0];
}
int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);
 
 
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Compilation message (stderr)

railway.cpp: In function 'void DFS(int, int)':
railway.cpp:16:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   16 |     for (int NXT : adj[X]) if (NXT != P) { DFS(NXT, X); } out[X] = timer - 1;
      |     ^~~
railway.cpp:16:59: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   16 |     for (int NXT : adj[X]) if (NXT != P) { DFS(NXT, X); } out[X] = timer - 1;
      |                                                           ^~~
railway.cpp: In function 'int getLCA(int, int)':
railway.cpp:21:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   21 |     if (isAnc(A, B)) return A; if (isAnc(B, A)) return B;
      |     ^~
railway.cpp:21:32: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   21 |     if (isAnc(A, B)) return A; if (isAnc(B, A)) return B;
      |                                ^~

• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 7 / 7
• Subtask 4: 29 / 29
• Subtask 5: 16 / 16
• Subtask 6: 25 / 25