459 - Graph Connectivity

[mahade hasan]

Post your updated code if you want. I took the code you posted most recently, changed the one line as I described, and got AC.

thanks man
its work but can u explain
why gets(Input);produce TLE
and if(gets(Input)==NULL) break;
is accepted

[brianfry713]

http://www.cplusplus.com/reference/clib ... tdio/gets/
Your code was stuck in an infinite loop at EOF.

[prodhan]

I'm getting WA. can anybody help me pls?

Code: Select all

#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<cstring>
using namespace std;

int par[30];


void make_set(int i)
{
     par[i] = i;
 }
 
int find(int r)
{

    if(par[r]==r) return r;
    else
    {
        return par[r] = find(par[r]);
        }
}
 
void Union(int a, int b)
{
     int u = find(a);
     int v = find(b);
     
     if(u==v) return;
     else{
          par[u] = v;
          }
 }

int main()
{
    
    int T,u,v,max,i,j,temp,res;
    char max_char;
    char edge[3];
    
    scanf("%d\n",&T);
    
    while(T--){
               
               
               while(1){
                   memset(edge,'\0',sizeof(edge));
                   gets(edge);
                   if(strlen(edge)==0) break;
                
                if(strlen(edge)==1){
                       max_char = edge[0];
                      
                   max = (int)max_char-64;
                   for(i=1; i<=max; i++)
                        make_set(i);
                    continue;
                       
                   }       
                         
                        
                 u = (int) edge[0] - 64;
                 v = (int) edge[1] - 64;
                 Union(u,v);
                   
             }
               sort(par+1,par+1+max);
               
               res = 0;
               
             
               for(i=1; i<max; i++){
                        if(find(par[i])!=find(par[i+1]))
                                res++;
               }
               
               printf("%d\n",res+1);

               if(T)
                    printf("\n");
               }
         
     return 0;
} 

Thanks in advance.

[brianfry713]

http://www.algorithmist.com/index.php/UVa_459

[AKJ88]

Hello.
Can anyone tell me what's wrong with my code?
Thanks.

Code: Select all

 Code was deleted after getting AC.

[brianfry713]

From uhunt:
lbv> AKJ88, don't print a blank line after the last test case

[AKJ88]

lbv & brianfry713, Thanks a lot.
Got AC.

[fazel]

i've tried every i/o i found in forums and got predicted answer

but still it gives me Wrong answer

help me for god sake .....

Code: Select all

ACC god, al ham du llellah

[fazel]

ACC

F***er ,
after the last output must have one endl not more or less

[brianfry713]

Input:

Code: Select all

2

E
AB
CE
DB
EC

E
AB
CE
DB
EC

[brianfry713]

Input:

Code: Select all

1

A

AC output: 1

[dumle]

Why am I getting WA? Ive tried several inputs and cant find anything wrong.

Code: Select all

removed after ac

[brianfry713]

Describe your algorithm.

[dumle]

Pretty much:

cin largest node letter, convert to int and insert into a vector

repeat until empty line:
{
getline and split the string into int a, int b
loop thru all vectors and check if a or b is in any vector
if: insert the missing one into the vector
if not: create a new vector with a and b (or only a if they're the same)

loop thru all vectors and check if you can find a or b in two vectors
if: join v and v[i+1] and remove duplicates. Remove v[i+1]
if not: do nothing
}

cout (largest node) - (sum of all vector sizes) + (number of vectors)

[brianfry713]

input:

Code: Select all

1

F
AB
CD
CE
CF
DE
DF

Output should be 2