Compilare: user.cpp: In function ‘bool solve(int, int)’: user.cpp:9:9: warning: unused variable ‘i’ [-Wunused-variable] int i,dc; ^ user.cpp: In function ‘int main()’: user.cpp:43:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccOznk4i.o: In function `main': user.cpp:(.text.startup+0x5c): warning: the `gets' function is dangerous and should not be used.