Submission #503033

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
503033	2022-01-07 03:16:54	sumit_kk10	Railway (BOI17_railway)	C++17	100 / 100	176 ms	37052 KiB

railway

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#include <bits/stdc++.h>
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL) 
#define ll long long
#define F first 
#define S second
using namespace std;
const int N = 100005, MOD = 1e9 + 7;
vector<ll> graph[N];
ll pre[N], dp[N][20], n, m, s, lvl[N], tin[N], tout[N], timer = 0, u[N], v[N];
 
void dfs(int source, int par, int level){
  dp[source][0] = par;
  lvl[source] = level;
  tin[source] = ++timer;
  for(auto k : graph[source])
    if(k != par)
      dfs(k, source, level + 1);
  tout[source] = timer;
}
 
void init(){
  dfs(1, -1, 0);
  for(int i = 1; i < 20; ++i)
    for(int j = 1; j <= n; ++j)
      if(dp[j][i - 1] != -1)
        dp[j][i] = dp[dp[j][i - 1]][i - 1];
}
 
ll LCA(int u, int v){
  if(lvl[u] > lvl[v]) swap(u, v);
 
 
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Compilation message (stderr)

railway.cpp: In function 'int main()':
railway.cpp:104:5: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
  104 |     while(t--)
      |     ^~~~~
railway.cpp:106:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while'
  106 |  return 0;
      |  ^~~~~~

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