Compilare: user.cpp: In function ‘void bfs(int, int)’: user.cpp:38:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(check(l0,c0)==true&&in_queue[l0][c0]==0) ^ user.cpp: In function ‘int main()’: user.cpp:54:13: warning: unused variable ‘l’ [-Wunused-variable] int i,j,l,c,l0,c0; ^ user.cpp:54:15: warning: unused variable ‘c’ [-Wunused-variable] int i,j,l,c,l0,c0; ^ user.cpp:54:17: warning: unused variable ‘l0’ [-Wunused-variable] int i,j,l,c,l0,c0; ^ user.cpp:54:20: warning: unused variable ‘c0’ [-Wunused-variable] int i,j,l,c,l0,c0; ^ user.cpp:52:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("volum.in","r",stdin); ^ user.cpp:53:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("volum.out","w",stdout); ^ user.cpp:56:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:59:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&h[i][j]); ^