Compilare: user.cpp: In function ‘void solve1()’: user.cpp:47:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(s); i++){ ^ /tmp/ccNErQW4.o: In function `citire()': user.cpp:(.text+0xf5): warning: the `gets' function is dangerous and should not be used.