/in/foo.cc: In function 'int cal(int, int, int)':
/in/foo.cc:60:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int i=p;i<G[x].size();i++)//G[x][i].st>=st
             ~^~~~~~~~~~~~
/in/foo.cc:62:22: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(G[x][i].st==st&&G[x][i].et==et||G[x][i].st!=st&&G[x][i].et<=et)