Compilare: main.cpp: In function 'int main()': main.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(sir); ) ~~^~~~~~~~~~~~~ main.cpp:36:18: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] cuv[8] = NULL; ^~~~ main.cpp:50:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < wrong.size(); ++i) ~~^~~~~~~~~~~~~~ main.cpp:56:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < good.size(); ++i) ~~^~~~~~~~~~~~~