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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. char keypad[][10]={ " ", ".+@$", "abc", "def", "ghi", "jkl" , "mno", "pqrs" , "tuv", "wxyz"};
  5. void generate_strings(char inp[],char out[],int i,int j){
  6.      if(inp[i]=='\0'){
  7. 		 out[j]='\0';
  8. 		 cout<<out<<endl;
  9. 		 return;
  10. 	 }
  11.    int digit=inp[i]-'0';
  12.    // no need of if cndition
  13. //    if(digit==0){
  14. // 	   generate_strings(inp,out,i+1,j);
  15. //    }
  16.    for(int k=0;keypad[digit][k]!='\0';k++){ // != not =
  17. 	   out[j]=keypad[digit][k];
  18. 	   generate_strings(inp,out,i+1,j+1);
  19.    }
  20.    return;
  21. }
  22. int main() {
  23. 	 char inp[100];
  24. 	 cin>>inp;
  25.  
  26. 	 char out[100];
  27. 	 generate_strings(inp,out,0,0);
  28. 	return 0;
  29. }
  30.  
Success #stdin #stdout 0.01s 5420KB
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https://ideone.com/ROHAEg
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
secret

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