/in/foo.cc:76:20: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
 const int inf=1<<31-1;
                  ~~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:81:6: warning: value computed is not used [-Wunused-value]
     n==read(),m==read(),Q=read(),u=read(),v=read(),T=read();
     ~^~~~~~~~
/in/foo.cc:81:16: warning: value computed is not used [-Wunused-value]
     n==read(),m==read(),Q=read(),u=read(),v=read(),T=read();
               ~^~~~~~~~