/in/foo.cc: In function 'void pr()':
/in/foo.cc:26:36: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
      f[i][j]=mn(f[i][j-1],f[i+(1<<j-1)][j-1]);
                                   ~^~
/in/foo.cc: In function 'int solve(int)':
/in/foo.cc:49:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^