Submission #846178

#	Time	Username	Problem	Language	Result	Execution time	Memory
846178		vjudge1	KOVANICE (COI15_kovanice)	C++17	0 / 100	48 ms	35524 KiB

kovanice

#include "bits/stdc++.h"
using namespace std;
#define pb push_back
#define endl "\n" 
#define int long long
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()

const int N = 3e5 + 5;

int par[N],siz[N],ans[N];
int find(int a){
	if(par[a]==a) return a;
	return par[a]=find(par[a]);
}

void merge(int a,int b){
  a=find(a),b=find(b);
  if(a==b) return;
  if(siz[a]>siz[b]) swap(a,b);
  siz[b]+=siz[a];
  par[a]=b;
}

vector<int> v[N],vis(N),v2[N],vis2(N);
int dp[N],dp2[N];

void dfs(int c){
  if(vis[c]) return;
  vis[c]=1;
  for(int x:v[c]){
  	dfs(x);
  	dp[c]=max(dp[c],dp[x]+1);
  }
}

void dfs2(int c){
  if(vis2[c]) return;
  vis2[c]=1;
  for(int x:v2[c]){
  	dfs2(x);
  	dp2[c]=max(dp2[c],dp2[x]+1);
  }
}


void solve(){
  iota(par,par+N,0LL);
  fill(siz,siz+N,1LL);
  memset(ans,-1,sizeof(ans));
  int c,n,m;
  cin >> c >> n >> m;
  
  vector<array<int,2>> edges;

  for(int i=1;i<=m;i++){
  	string s;
  	cin >> s;
  	int a=s[0]-'0';
  	int b=s[2]-'0';
    if(s[1]=='=') merge(a,b);
    else edges.pb({b,a});
  }
  
  map<array<int,2>,int> mp;

  for(array<int,2> x:edges){
  	int a=x[0],b=x[1];
  	a=find(a),b=find(b);
  	if(mp[{a,b}]) continue;
  	mp[{a,b}]=1;
  	v[a].pb(b);
  	v2[b].pb(a);
  }
  
  for(int i=1;i<=n;i++){
  	dfs(find(i));
  	dfs2(find(i));
  }

  for(int i=1;i<=n;i++){
  	int ub=c-dp2[find(i)];
  	int lb=1+dp[find(i)];
  	if(ub==lb) ans[find(i)]=ub;
  }
  
  for(int i=1;i<=n;i++){
  	if(ans[find(i)]==-1) cout << '?' << endl;
  	else cout << 'K' << ans[find(i)] << endl;
  }
} 

int32_t main(){

  cin.tie(0); ios::sync_with_stdio(0);
  
  int t=1;//cin >> t;
  while(t--) solve();

  return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 10
• Subtask 4: 0 / 40