Compilare: user.cpp:9:0: warning: "INFINITY" redefined [enabled by default] #define INFINITY (1 << 30) ^ In file included from /usr/include/math.h:40:0, from /usr/include/c++/4.8/cmath:44, from user.cpp:1: /usr/include/i386-linux-gnu/bits/inf.h:27:0: note: this is the location of the previous definition # define INFINITY (__builtin_inff()) ^ user.cpp: In function ‘void dijkstra(int*, int, int)’: user.cpp:39:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < gr[node].size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:55:24: warning: unused variable ‘minn’ [-Wunused-variable] int n, m, a, b, c, minn, res = 0; ^ user.cpp:55:30: warning: unused variable ‘res’ [-Wunused-variable] int n, m, a, b, c, minn, res = 0; ^