0_0_23193478_24464.cpp: In function 'int main()':
0_0_23193478_24464.cpp:44:11: error: redeclaration of 'std::string tt'
string tt(txt+j-n,n)???????????
^
0_0_23193478_24464.cpp:43:20: note: 'std::string tt' previously declared here
string tt(txt+j-n);//????????.???????
^
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