Compilare: user.cpp: In function ‘void bellmanFord(int, long long int*, int*)’: user.cpp:49:9: warning: unused variable ‘first’ [-Wunused-variable] int first = 0, last = 0; ^ user.cpp:49:20: warning: unused variable ‘last’ [-Wunused-variable] int first = 0, last = 0; ^ user.cpp:57:9: warning: unused variable ‘num’ [-Wunused-variable] int num = 1, u; ^ user.cpp:59:9: warning: unused variable ‘mod’ [-Wunused-variable] int mod = N - 1; ^ user.cpp: In function ‘int main()’: user.cpp:106:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < sol.size(); ++i) ^ user.cpp:113:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < sol.size(); ++i) ^ user.cpp:120:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < sol.size(); ++i) ^