Compilare: user.cpp: In function ‘void two(int, unsigned int*, int, int, int&)’: user.cpp:7:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(numbers[mid]>=x) where=mid; ^ user.cpp:8:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x<=numbers[mid] && mid-1>=left) two(x,numbers,left,mid-1,where); ^ user.cpp: In function ‘void one(int, unsigned int*, int, int, int&)’: user.cpp:15:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(numbers[mid]<=x) where=mid; ^ user.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x>=numbers[mid] && mid+1<=right) one(x,numbers,mid+1,right,where); ^ user.cpp: In function ‘void zero(int, unsigned int*, int, int, int&)’: user.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(numbers[mid]==x) where=mid; ^ user.cpp:24:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x>=numbers[mid] && mid+1<=right) zero(x,numbers,mid+1,right,where); ^