Compilare: user.cpp: In function ‘void build(int, int, int)’: user.cpp:57:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (col[st].size()>pos[st]) arb[nod].mx=col[st][pos[st]],arb[nod].posm=st,pos[st]++; else ^ user.cpp: In function ‘void update(int, int, int, int)’: user.cpp:72:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (col[st].size()>pos[st]) arb[nod].mx=col[st][pos[st]],arb[nod].posm=st,pos[st]++; else ^ user.cpp: In function ‘int main()’: user.cpp:101:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("placute.in","r",stdin); ^ user.cpp:102:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("placute.out","w",stdout); ^ user.cpp:104:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:106:81: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i=1;i<=n;i++) scanf("%d %d",&t[i].g,&t[i].c),col[t[i].c].pb(t[i].g); ^