Compilare: user.cpp: In function ‘long int collide(long int, long int)’: user.cpp:36:27: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] rem |= (1 << i-1); ^ user.cpp:37:27: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] rem |= (1 << i+1); ^ user.cpp:41:23: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] rem |= (1 << n-1); ^ user.cpp: In function ‘void bellman()’: user.cpp:79:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[node].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:109:12: warning: unused variable ‘c’ [-Wunused-variable] int a, c, t; ^