Compilare: user.cpp: In function ‘int bfs()’: user.cpp:30:19: warning: unused variable ‘leg’ [-Wunused-variable] int curr,next,leg; ^ user.cpp: In function ‘int main()’: user.cpp:61:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.in","r",stdin); ^ user.cpp:62:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.out","w",stdout); ^ user.cpp:64:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&m,&e); ^ user.cpp:68:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&v,&u); ^ user.cpp: In function ‘int bfs()’: user.cpp:25:17: warning: iteration 20010u invokes undefined behavior [-Waggressive-loop-optimizations] viz[i]=0; ^ user.cpp:23:5: note: containing loop for(int i=0;i<=20011;i++) ^