Compilare: user.cpp: In function ‘int main()’: user.cpp:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int n=1;n<=N;n++) nr[n][1]=1; ^ user.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int n=1;n<=N;n++) ^ user.cpp:19:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=1;k<=K;k++) ^ user.cpp:20:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int z=d1;z<=d2;z++) ^ user.cpp:21:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(n+z+1<=N) nr[n+z+1][k+1]+=nr[n][k]; ^ user.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=N;i++) sol+=nr[i][K]; ^