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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n,t;
  6. 	cin>>n>>t;
  7. 	if(n==1 && t<10) cout<<t;
  8. 	else if(n==1 && t>=10) cout<<-1;
  9. 	else{
  10. 		if(t==2){
  11. 			string s="1";
  12. 			for(int i=0;i<n-2;i++)s=s+'0';
  13. 			s=s+'2';
  14. 			cout<<s;
  15. 		}
  16. 		else if(t==3){
  17. 			string s="3";
  18. 			for(int i=0;i<n-2;i++)s=s+'0';
  19. 			s=s+'3';
  20. 			cout<<s;
  21. 		}
  22. 		else if(t==4){
  23. 			string s="4";
  24. 			for(int i=0;i<n-2;i++)s=s+'0';
  25. 			s=s+'4';
  26. 			cout<<s;
  27. 		}
  28. 		else if(t==5){
  29. 			string s="5";
  30. 			for(int i=0;i<n-2;i++)s=s+'0';
  31. 			s=s+'5';
  32. 			cout<<s;
  33. 		}
  34. 		else if(t==6){
  35. 			string s="6";
  36. 			for(int i=0;i<n-2;i++)s=s+'0';
  37. 			s=s+'6';
  38. 			cout<<s;
  39. 		}else if(t==7){
  40. 			string s="3";
  41. 			for(int i=0;i<n-2;i++)s=s+'0';
  42. 			s=s+'7';
  43. 			cout<<s;
  44. 		}
  45. 		else if(t==8){
  46. 			string s="3";
  47. 			for(int i=0;i<n-2;i++)s=s+'0';
  48. 			s=s+'8';
  49. 			cout<<s;
  50. 		}
  51. 		else if(t==9){
  52. 			string s="9";
  53. 			for(int i=0;i<n-2;i++)s=s+'0';
  54. 			s=s+'9';
  55. 			cout<<s;
  56. 		}
  57. 		else if(t==10){
  58. 			string s="10";
  59. 			for(int i=0;i<n-2;i++)s=s+'0';
  60. 			cout<<s;
  61. 		}
  62.  
  63. 	}
  64. 	return 0;
  65. }
Success #stdin #stdout 0s 4128KB
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https://ideone.com/sTVlwS
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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