Submission #297856

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
297856	2020-09-12 05:23:09	tmwilliamlin168	Swapping Cities (APIO20_swap)	C++14	100 / 100	557 ms	41792 KiB

swap

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#include "swap.h"
#include <bits/stdc++.h>
using namespace std;
#define ar array
const int mxN=1e5;
int n, a[mxN], r[mxN];
struct tree {
  int d[mxN], anc[mxN][17], b1[mxN][17];
  vector<ar<int, 2>> adj[mxN];
  vector<int> adj2[mxN];
  int find(int x) {
    return x^r[x]?r[x]=find(r[x]):x;
  }
  void dfs2(int u, int w) {
    a[u]=min(w, a[u]);
    for(int v : adj2[u])
      dfs2(v, w);
    adj2[u].clear();
  }
  bool join(int x, int y, int w) {
    if((x=find(x))==(y=find(y)))
      return 0;
    r[x]=y;
    if(a[y]<=1e9)
      dfs2(x, w);
    if(a[x]<=1e9)
      dfs2(y, w);
 
 
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• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 17 / 17
• Subtask 4: 20 / 20
• Subtask 5: 23 / 23
• Subtask 6: 27 / 27