C Language Programming Questions 002

Give two integers, L and R, where l<=a<=b<=r, and then find the maximum number of a^b values. Which 1<=l<=r<=1000.

For example L = 1; R = 3;

L 0001

R 0011

There is also 0010 in the middle of LR, where the maximum value is 0001 ^ 0010 = 0011; the output is 2.

Write a function to calculate the number;

I wrote one, but did not pass the final test, only 12 points, total 20 points, do not know where to improve?

1#include <stdio.h>2#include <string.h>3#include <math.h>4#include <stdlib.h>5#include <assert.h>6 #defineMAXSIZE (1000)7 /*8 the maximum XOR value for two numbers. 9  */Ten  One  A /* -  *  -  */ the intMaxxor (intLintR) - { -     //ASSERT use method: Put in function start, detect the legality of function parameter -ASSERT (L >=1); +ASSERT (R <=MAXSIZE); -ASSERT (L <=R); +      A     //Number of Bits at     intLENGTHL =sizeof(l) *8; -     intLengthr =sizeof(r) *8; -     //Maximum Value -     intMax =0; -     intLen = (l+r)/2; -     //flag Bit in     intflag0, Flag1; -     //Two for loops traverse all combinations of Ken to      for(inti = l; I <= Len; i++) +     { -         //printf ("i=%d", I); the  *            for(intj = r; J >= Len; j--) $           {Panax Notoginseng                  //printf ("j=%d\n", j); -                the                  //Initialize various values +LENGTHL =sizeof(l) *8; ALengthr =sizeof(r) *8; theFLAG0 =0; +Flag1 =0; -                $                  //Judging from the highest bit $                   while(LENGTHL-->0&& Lengthr-->0) -                  { -                      if(i>>lengthl ^ j>>lengthr)//XOR is 1, record the                      { -                         //printf ("flag1=%d\n", Flag1);WuyiFlag1 + +;// the                      } -                      Else Wu                      { -                          //printf ("flag0=%d\n", flag0); AboutFLAG0 + +; $                          if(Flag1! =0)//if the XOR result first appears after 1, 0 is definitely not the maximum value, exiting the while loop -                          { -printf"break\n"); -                               Break;//exit the While loop and remove a number A                          } +                      } the                      //output maximum, as long as the loop is not exited prematurely, so that it is possible to be the maximum value -                      //Compare all eligible values and take the maximum value $                      if((flag0 + flag1) = =sizeof(l) *8) the                      { the                          if(Max < (i ^j)) the                          { theMax = (i ^j); -                             //printf ("Output Max =%d\n", Max); in                              the                          } the                      } About                  } the                the                the           } +       -     } the     //printf ("Output maximum: \ n");Bayi  the     returnMax; the } -  -  the  the  the intMain () the { -     intRes; the     int_l; thescanf"%d", &_l); the     94     int_r; thescanf"%d", &_r); the      theres =Maxxor (_l, _r);98printf"%d", res); About      -     return 0;101}

C Language Programming Questions 002