Compilare: user.cpp: In function ‘int main()’: user.cpp:13:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=d; ++i) a[1][i]=i; ^ user.cpp:14:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=p; ++i) a[i][1]=1; ^ user.cpp:15:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2; i<=p; ++i) ^ user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=2; j<=d; ++j) a[i][j]=a[i-1][j]+a[i][j-1]; ^