/in/cipher.cpp: In function 'std::__cxx11::string encrypt(std::__cxx11::string)':
/in/cipher.cpp:88:18: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for(int i=0;i<message.length();i++) {
                 ~^~~~~~~~~~~~~~~~~
/in/cipher.cpp: In function 'std::__cxx11::string decrypt(std::__cxx11::string)':
/in/cipher.cpp:189:18: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for(int i=0;i<message.length();i=i+3) {
                 ~^~~~~~~~~~~~~~~~~
/in/cipher.cpp: In function 'std::__cxx11::string toSparse(std::__cxx11::string)':
/in/cipher.cpp:242:18: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for(int i=0;i<message.length();i=i+3) {
                 ~^~~~~~~~~~~~~~~~~
/in/cipher.cpp: In function 'std::__cxx11::string toCompact(std::__cxx11::string)':
/in/cipher.cpp:255:18: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for(int i=0;i<message.length();i++) {
                 ~^~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
/in/compile/Makefile:23: recipe for target 'cipher.o' failed
make: *** [cipher.o] Error 1