Compilare: user.cpp:9:52: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] int ap[2001],c[18],n,m,k,x,y,j,i,z,Cost[18][18],C[1<<18+3][18],N,Sol; ^ user.cpp: In function ‘void djikstra(int)’: user.cpp:22:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<A[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:70:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < a[j].size(); ++k) ^