Compilare: main.cpp: In function 'bool gasit(int, int)': main.cpp:20:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k=0;k<y.length();k++) ~^~~~~~~~~~~ main.cpp:24:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos==x.length()) ~~~^~~~~~~~~~~~ main.cpp:27:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos!=y.length()) ~~~^~~~~~~~~~~~