Compilare: user.cpp: In function ‘int bfs(int, int)’: user.cpp:46:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:149:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<t.size();i++) bfs(i+2,t[i]); ^ user.cpp:134:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n1,n2; ^ user.cpp:135:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac2.in","r",stdin); ^ user.cpp:136:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac2.out","w",stdout); ^ user.cpp:137:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&m1,&u,&fin); ^ user.cpp:138:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=u;i++) { scanf("%d",&n1); t.pb(n1);} ^ user.cpp:141:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n1,&n2); ^