Compilare: user.cpp: In function ‘void dij(int)’: user.cpp:23:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:38:13: warning: unused variable ‘j’ [-Wunused-variable] int m,i,j,cost,a,b,x,y; ^ user.cpp:41:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&n,&m,&x,&y); ^ user.cpp:43:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&a,&b,&cost); ^