Run id: 3450

Main.cc:4:18: error: empty character constant
     string a,b,c='';
                  ^
Main.cc: In function 'int main()':
Main.cc:6:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<a.size();i++){
                          ^
Main.cc:7:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=i;j<i+b.size();j++){
                                ^
Main.cc:13:5: error: expected ';' before 'return'
     return 0;
     ^