src.cpp: In function 'void doc()':
src.cpp:18:10: error: 'else' without a previous 'if'
}else
^
src.cpp:19:14: error: 'j' was not declared in this scope
if(a[j]-a[i]>k)
^
src.cpp:19:19: error: 'i' was not declared in this scope
if(a[j]-a[i]>k)
^
src.cpp:20:17: error: break statement not within loop or switch
break;
^