Compilare: main.cpp: In function 'void query(int, int, int)': main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<arb[nod].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:47:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<qry[st].size();i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:71:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("colors2.in","r",stdin); ^ main.cpp:72:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("colors2.out","w",stdout); ^ main.cpp:74:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ main.cpp:77:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:82:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^ main.cpp:90:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&b[i]); ^ main.cpp:96:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^