/in/foo.cc: In function 'void build_t(long long int)':
/in/foo.cc:40:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     ls.l=fa.l, ls.r=fa.l+fa.r>>1;
                     ~~~~^~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:106:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(R II k=0;k<wei[j].size();k++) {
                          ~^~~~~~~~~~~~~~
/in/foo.cc:98:15: warning: unused variable 'ans' [-Wunused-variable]
     p=0; R II ans=1e18;
               ^~~