Compilare: user.cpp: In function ‘void sort(unsigned int*, unsigned int, unsigned int)’: user.cpp:14:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (arr[i] < pivot) ^ user.cpp:16:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (arr[j] > pivot) ^ user.cpp:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (left < j) ^ user.cpp:30:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < right) ^ user.cpp: In function ‘int main()’: user.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:39:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=m;i++) ^ user.cpp:42:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:44:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( j=1;j<=m;j++) ^