Compilare: main.cpp: In function 'void Solution()': main.cpp:64:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int idx = 0 ; idx < str.length() ; ++ idx) ~~~~^~~~~~~~~~~~~~ main.cpp:82:21: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (int i = 0 ; i < 6 ; ++ i) ^~~ main.cpp:84:25: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return; ^~~~~~