Submission #314154

#	Time	Username	Problem	Language	Result	Execution time	Memory
314154		kimbj0709	KOVANICE (COI15_kovanice)	C++14	100 / 100	369 ms	62968 KiB

kovanice

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define maxn 300050
int n,m,q;
vector<int> ufds(maxn);
vector<vector<int> > nodes(maxn);
vector<int> ins(maxn,0);
vector<int> depth(maxn,-1);
vector<vector<int> > adj(maxn);
vector<int> treated(maxn,0);
vector<int> ans(maxn,0);
vector<vector<int> > gives(maxn);
int find(int k){
  if(ufds[k]!=k){
    ufds[k] = find(ufds[k]);
  }
  return ufds[k];
}
void merge(int a,int b){
  int temp1 = find(a);
  int temp2 = find(b);
  if(temp1==temp2){
    return;
  }
  if(nodes[temp1].size()<nodes[temp2].size()){
    swap(temp1,temp2);
  }
  for(auto k:nodes[temp2]){
    nodes[temp1].push_back(k);
  }
  nodes[temp2].clear();
  ufds[temp2] = temp1;
}
int find_height(int node){
  if(depth[node]!=-1){
    return depth[node];
  }
  int mxx = 0;
  for(auto k:adj[node]){
    int aa = find(k);
    int tt = find_height(aa);
    if(tt>mxx){
      gives[node].clear();
      gives[node].push_back(aa);
      mxx = tt;
    }
    else if(tt==mxx){
      gives[node].push_back(aa);
    }
  }
  //cout << node << " " << mxx+1 << "--\n";
  depth[node] = mxx+1;
  return depth[node];
}
void update(int node,int current){
  if(ans[node]!=0){
    return;
  }
  ans[node] = current;
  for(auto k:gives[node]){
    update(k,current-1);
  }
  return;
}
int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(0);cout.tie(0);
  cin >> n >> m >> q;
  for(int i=0;i<ufds.size();i++){
    ufds[i] = i;
    nodes[i].push_back(i);
  }
  int a,c;
  char b;
  for(int i=0;i<q;i++){
    cin >> a >> b >> c;
    if(b=='<'){
      adj[c].push_back(a);
      ins[a]++;
    }
    else if(b=='='){
      merge(a,c);
    }
  }
  for(int i=1;i<=m;i++){
    int tt = find(i);
    if(tt==i){
      continue;
    }
    for(auto k:adj[i]){
      adj[tt].push_back(k);
    }
  }
  for(int i=1;i<=m;i++){
    if(ins[i]==0){
      int aa = find_height(i);
      //cout << i << " " << aa << endl;
      if(aa==n){
        update(i,n);
      }
    }
  }
  for(int i=1;i<=m;i++){
    if(ans[i]==0){
      continue;
    }
    int par = find(i);
    if(treated[par]==1){
      continue;
    }
    treated[par] = 1;
    for(auto k:nodes[par]){
      ans[k] = ans[i];
    }
  }
  for(int i=1;i<=m;i++){
    if(ans[i]==0){
      cout << "?" << "\n";
    }
    else{
      cout << "K" << ans[i] << "\n";
    }
  }

}

Compilation message (stderr)

kovanice.cpp: In function 'int32_t main()':
kovanice.cpp:70:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |   for(int i=0;i<ufds.size();i++){
      |               ~^~~~~~~~~~~~

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