Submission #784840

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
784840	2023-07-16 15:13:27	jakobrs	Tracks in the Snow (BOI13_tracks)	C++17	100 / 100	1871 ms	1048576 KiB

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#include <iostream>
#include <set>
#include <vector>
using i32 = int32_t;
struct UnionFind {
  std::vector<i32> parent;
  explicit UnionFind(size_t sz) : parent(sz, -1) {}
  i32 find(i32 u) {
    if (parent[u] < 0)
      return u;
    else
      return parent[u] = find(parent[u]);
  }
  bool unite(i32 u, i32 v) {
    u = find(u);
    v = find(v);
    if (u == v) {
      return false;
    } else {
      if (-parent[u] < -parent[v])
        std::swap(u, v);
      parent[u] += parent[v];
      parent[v] = u;
 
 
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Compilation message (stderr)

tracks.cpp: In function 'int main()':
tracks.cpp:51:17: warning: unused variable 'row' [-Wunused-variable]
   51 |     const auto &row = grid[r];
      |                 ^~~

• Subtask 1: 30 / 30
• Subtask 2: 70 / 70