Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:14:13: warning: unused variable ‘vec’ [-Wunused-variable] int nod,vec,mm; ^~~ user.cpp: In function ‘int main()’: user.cpp:38:21: warning: unused variable ‘k’ [-Wunused-variable] int n,m,i,s,x,y,k=0; ^ user.cpp:39:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d\n",&n,&m,&s); ^ user.cpp:42:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^ user.cpp: In function ‘void BFS(int)’: user.cpp:25:19: warning: array subscript is above array bounds [-Warray-bounds] mm=t[1][mm]; ~~~^ user.cpp: In function ‘int main()’: user.cpp:44:12: warning: array subscript is above array bounds [-Warray-bounds] t[1][i]=start[x]; ~~~^