Compilare: main.cpp: In function 'int main()': main.cpp:12:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++) ~^~~~~~~~~~ main.cpp:25:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=strlen(s);i>=strlen(s)-mn+1;i--) ~^~~~~~~~~~~~~~~~