Submission #209262

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
209262	2020-03-13 14:13:48	dennisstar	Synchronization (JOI13_synchronization)	C++17	100 / 100	390 ms	29432 KiB

synchronization

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#include <bits/stdc++.h>
#define eb emplace_back
using namespace std;
typedef vector<int> vim;
const int MX = 100005;
int N, M, Q, c, X[MX], Y[MX], Z[MX], lst[MX];
int in[MX], out[MX], chk[MX];
vim adj[MX], spt[MX];
int F[MX];
void upd(int t, int v) { while (t<=N) F[t]+=v, t+=t&-t; }
int get(int t) { int r=0; while (t) r+=F[t], t-=t&-t; return r; }
void dfs(int n, int p) {
  spt[n].eb(p); in[n]=++c;
  for (int i=0; i<spt[spt[n][i]].size(); i++) spt[n].eb(spt[spt[n][i]][i]);
  for (auto &i:adj[n]) if (i!=p) dfs(i, n);
  out[n]=c+1;
}
int gp(int t) {
  int x=get(in[t]);
  for (int i=20; i>=0; i--) if (i<spt[t].size()&&x==get(in[spt[t][i]])) t=spt[t][i];
  return t;
}
int main() {
  cin.tie(0)->sync_with_stdio(0);
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

synchronization.cpp: In function 'void dfs(int, int)':
synchronization.cpp:18:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0; i<spt[spt[n][i]].size(); i++) spt[n].eb(spt[spt[n][i]][i]);
                ~^~~~~~~~~~~~~~~~~~~~~~
synchronization.cpp: In function 'int gp(int)':
synchronization.cpp:25:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=20; i>=0; i--) if (i<spt[t].size()&&x==get(in[spt[t][i]])) t=spt[t][i];
                                ~^~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 10 / 10
• Subtask 4: 20 / 20
• Subtask 5: 40 / 40