ok...i solved my TLE 6 and TLE 7 problems, now i think it s more than fast enough
but i god WA#1 even though it gives good answers too all tests on my machine....

any ideas what s wrong ? can someone give me test 1 ?


#include<iostream>
#include<vector>

using namespace std;

int main(){

    vector<char> tab;
    char x, previous;
    int size=0,j=0;
    while(!(cin >> x).eof()){
          if(x!=previous){
                   tab.push_back(x);
                   j++;
                   previous=x;
                   }
          else{
               tab.pop_back();
               j--;
               if(j>=1)
               previous = tab[j-1];
               else
               previous = '!';
              }
          }
    for( int i = 0; i < tab.size(); i++ ){
         cout << tab[ i ];
         }
    getchar();getchar();
}

Edited by author 09.08.2011 19:27

try
abhhcggcffbeedda

answer must be an empty string

and so it is.
...
any other ideas ?
i really dont know what else to do.

You can't do a getchar() when the judge won't write any char! :p