Code wrong count subsequences

#1

#include<bits/stdc++.h>
using namespace std;
int main() {
int t;
cin>> t;
while(t–)
{

	string s;
	cin>> s;
	set<string> pp;
	int l=s.length();
	cout<<l<<endl;
	for(int i=0;i<l;i++)
      {
		  for(int j=i;j<l;j++)
		  {
			  string r=s.substr(i,j);
			  pp.insert(r);
		  }
	  }
	  int k=1;
	  for(auto it=pp.begin();it!=pp.end();it++)
	  {
		  cout<<*it<<endl;
		  k++;
	  }
	  cout<<k<<endl;
}
return 0;

}

#2

Hey @sunneykumar309 please share your code using ide.codingblocks.com

#3
#4

Debugging your code, please be patient.

#5

source.cpp:6:9: warning: null character(s) ignored
6 | while(tb )
| ^
source.cpp:6:10: error: stray ‘\23’ in program
6 | while(tb )
| ^
source.cpp: In function ‘int main()’:
source.cpp:6:7: error: ‘tb’ was not declared in this scope; did you mean ‘t’?
6 | while(tb )
| ^~
| t

#6

now i am getting this error

#7


The error was in while condition, it should have been t-- instead of t-

#8

how to approach this q
my approach is wrong because it gives only susstring

#9

substring not the subsequences

#10

Tell me are you familiar with the concept of recursion?

#11

yes i am but still while using

#12

So , this question will be solved by using concept of dp , so I want you to tell me that do you want me tell you Dp approach or first you will do it yourself and then ask for help?

#13

recursion .
Can you please me tell me how to be perfect at Dp and recursion.

#14

Practice as much questions of dp and recursion. First do all the questions of your course on this topic , then go on leetcode and hackerrank for more questions.

There would be an explanation video in your course name Subsequences Generation Recursion . It will give you a better explanation.

#15

can you please tell me atleast how many q should i do.

#16

Bro don’t go with quantity, go with quality. Unless and until you don’t get an idea of how dp works. Try different different questions. You getting me?

#17

yes.i want to practice a lot’s of question but once i stuck and i have no idea that how to approach then what should i do ? Is moving a good decision.

#18

Until you have TA support you can post your question here as a doubt in which you will face problem. All TA’s are good , they will help you in approach as well as in debugging your code :slight_smile:

1 Like
#19

now i am in second year how much time should i give in a question.
1 day,2 day or couple of hours

#20

Couple of hours would be enough.

1 Like