password.cpp: In function 'std::string guess(long long int, long long int)':
password.cpp:14:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
14 | for(int j=0; j<c.size(); j++){
| ~^~~~~~~~~
password.cpp:16:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
16 | for(int i=0; i<c.size(); i++){
| ~^~~~~~~~~
/usr/bin/ld: /tmp/ccho3x6O.o: in function `main':
grader.cpp:(.text.startup+0x66): undefined reference to `guess[abi:cxx11](int, int)'
collect2: error: ld returned 1 exit status