Submission #48597

#	Time	Username	Problem	Language	Result	Execution time	Memory
48597		Pajaraja	Factories (JOI14_factories)	C++17	0 / 100	6107 ms	167752 KiB

factories

#include "factories.h"
#include <bits/stdc++.h>
#define MAXN 500007
using namespace std;
vector<int> g[MAXN],gt[MAXN];
vector<long long> c[MAXN],d[MAXN];
int p[MAXN],n,sz,cn,in[MAXN],gl,arr[MAXN];
long long be[MAXN];
bool vc[MAXN];
int dfssize(int s,int f)
{
	int x=1;
	for(int i=0;i<g[s].size();i++) if(g[s][i]!=f && !vc[g[s][i]]) x+=dfssize(g[s][i],s);
	return x;
}
int dfsc(int s,int f)
{
	int x=1;
	bool ce=true;
	for(int i=0;i<g[s].size();i++) if(g[s][i]!=f && !vc[g[s][i]]) 
	{
		int a=dfsc(g[s][i],s);
		if(a>sz/2) ce=false;
		x+=a;
	}
	if(sz-x>sz/2) ce=false;
	if(ce) cn=s;
	return x;
}
void dfst(int s)
{
	in[s]=gl++;
	for(int i=0;i<gt[s].size();i++) dfst(gt[s][i]);
	arr[s]=gl-in[s];
}
void dfs(int s,int f,long long dist,int po)
{
	if(s==p[po]) return;
	//d[po][in[s]-in[po]]=dist;
	for(int i=0;i<g[s].size();i++) if(g[s][i]!=f) dfs(g[s][i],s,dist+c[s][i],po);
}
void centrodecomp(int s,int f)
{
	sz=dfssize(s,-1);
	dfsc(s,-1);
	p[cn]=f;
	vc[cn]=true;
	int tmp=cn;
	for(int i=0;i<g[tmp].size();i++) if(!vc[g[tmp][i]]) centrodecomp(g[tmp][i],tmp);
}
void Init(int N, int A[], int B[], int D[]) 
{
	n=N;
	int root;
	for(int i=0;i<n-1;i++) {g[A[i]].push_back(B[i]); g[B[i]].push_back(A[i]); c[A[i]].push_back(D[i]); c[B[i]].push_back(D[i]);}
	centrodecomp(1,-1);
	for(int i=0;i<n;i++) {if(p[i]!=-1) gt[p[i]].push_back(i); else root=i;}
	dfst(root);
	for(int i=0;i<n;i++) for(int j=0;j<arr[i];j++) d[i].push_back(0);
	for(int i=0;i<n;i++) dfs(i,-1,0,i);
	fill(be,be+MAXN,1000000000000000000LL);
}
long long di(int a,int b) {return 0/*d[a][in[b]-in[a]]*/;}
long long Query(int S, int X[], int T, int Y[]) 
{
	int s=S,t=T;
	long long sk=1000000000000000000LL;
	for(int i=0;i<s;i++)
	{
		int a=X[i];
		while(a!=-1) {be[a]=min(be[a],di(a,X[i])); a=p[a];}
	}
	for(int i=0;i<t;i++)
	{
		int a=Y[i];
		while(a!=-1) {sk=min(sk,di(a,Y[i])+be[a]); a=p[a];}
	}
	for(int i=0;i<s;i++)
	{
		int a=X[i];
		while(a!=-1) {be[a]=1000000000000000000LL; a=p[a];}
	}
	return sk;
}

Compilation message (stderr)

factories.cpp: In function 'int dfssize(int, int)':
factories.cpp:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[s].size();i++) if(g[s][i]!=f && !vc[g[s][i]]) x+=dfssize(g[s][i],s);
              ~^~~~~~~~~~~~
factories.cpp: In function 'int dfsc(int, int)':
factories.cpp:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[s].size();i++) if(g[s][i]!=f && !vc[g[s][i]]) 
              ~^~~~~~~~~~~~
factories.cpp: In function 'void dfst(int)':
factories.cpp:33:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<gt[s].size();i++) dfst(gt[s][i]);
              ~^~~~~~~~~~~~~
factories.cpp: In function 'void dfs(int, int, long long int, int)':
factories.cpp:40:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[s].size();i++) if(g[s][i]!=f) dfs(g[s][i],s,dist+c[s][i],po);
              ~^~~~~~~~~~~~
factories.cpp: In function 'void centrodecomp(int, int)':
factories.cpp:49:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[tmp].size();i++) if(!vc[g[tmp][i]]) centrodecomp(g[tmp][i],tmp);
              ~^~~~~~~~~~~~~~
factories.cpp: In function 'void Init(int, int*, int*, int*)':
factories.cpp:58:6: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
  dfst(root);
  ~~~~^~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 18
• Subtask 3: 0 / 67