0_0_30197567_28218.cpp: In function 'int main()':
0_0_30197567_28218.cpp:14:2: error: expected ';' before 'long'
long long len = max(a.length(),b.length()) +1 ;
^
0_0_30197567_28218.cpp:15:14: error: 'len' was not declared in this scope
a = string( len - a.length() , '0' ) + a ;
^
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