Compilare: main.cpp: In function 'void bfs(int)': main.cpp:16:7: warning: unused variable 'i' [-Wunused-variable] int i,first; ^ main.cpp: In function 'int main()': main.cpp:38:17: warning: unused variable 'nr' [-Wunused-variable] int n,m,x,y,i,nr,j; ^~ main.cpp:38:20: warning: unused variable 'j' [-Wunused-variable] int n,m,x,y,i,nr,j; ^ main.cpp:39:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&n,&m,&s); ^ main.cpp:41:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^