Compilare: main.cpp: In function 'int main()': main.cpp:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<strlen(s)-1;i+=2) ~^~~~~~~~~~~~ main.cpp:24:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<strlen(s)-1;i+=2) ~^~~~~~~~~~~~ main.cpp:42:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=strlen(s)-1;i++) ~^~~~~~~~~~~~~ main.cpp:15:5: warning: array subscript is below array bounds [-Warray-bounds] s[-1]=0; ~~~~^