Compilare: user.cpp: In function ‘void req()’: user.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;i++) d[0][i] = a[i]; ^ user.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=lg;i++) ^ user.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<n;j++) ^ user.cpp: In function ‘void af()’: user.cpp:38:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<lg;i++){ ^ user.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<n;j++) ^ user.cpp: In function ‘int main()’: user.cpp:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;i++){ ^ user.cpp:68:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m;i++) { ^