2 bizhen npu bizhen_npu 于 2016.03.06 21:27 提问

Runtime Error(ACCESS_VIOLATION) 错误,高手们看下,谢谢了!

题目:

Problems in Computer Science are often classified as belonging to a certain class of problems (e.g., NP, Unsolvable, Recursive). In this problem you will be analyzing a property of an algorithm whose classification is not known for all possible inputs.

Consider the following algorithm:

1.      input n 

2.      print n 

3.      if n = 1 then STOP 

4.           if n is odd then n <- 3n + 1 

5.           else n <- n / 2 

6.      GOTO 2 

Given the input 22, the following sequence of numbers will be printed 22 11 34 17 52 26 13 40 20 10 5 16 8 4 2 1

It is conjectured that the algorithm above will terminate (when a 1 is printed) for any integral input value. Despite the simplicity of the algorithm, it is unknown whether this conjecture is true. It has been verified, however, for all integers n such that 0 < n < 1,000,000 (and, in fact, for many more numbers than this.)

Given an input n, it is possible to determine the number of numbers printed (including the 1). For a given n this is called the cycle-length of n. In the example above, the cycle length of 22 is 16.

For any two numbers i and j you are to determine the maximum cycle length over all numbers between i and j.

Input

The input will consist of a series of pairs of integers i and j, one pair of integers per line. All integers will be less than 1,000,000 and greater than 0.

You should process all pairs of integers and for each pair determine the maximum cycle length over all integers between and including i and j.

You can assume that no opperation overflows a 32-bit integer.

Output

For each pair of input integers i and j you should output i, j, and the maximum cycle length for integers between and including i and j. These three numbers should be separated by at least one space with all three numbers on one line and with one line of output for each line of input. The integers i and j must appear in the output in the same order in which they appeared in the input and should be followed by the maximum cycle length (on the same line).

Sample Input

1 10
100 200
201 210
900 1000

Sample Output

1 10 20
100 200 125
201 210 89
900 1000 174

题意:
题的大意是输入两个数(注意,这里没有说第一个数一定要小与第二个数),然后对这两个数之间的所有整数包括端点的数,进行一种规律运算,并求出运算的次数,比较所有的数规律运算次数,输出最大的

总是出现 Runtime Error(ACCESS_VIOLATION) 的错误,高手们看下,谢谢了!

我的代码:
#include
#include
int count=0;
int box[2000000]={0};
void calculate(int num){
if(box[num]!=0) {
count+=box[num];
return ;
}
if(num==1) return ;
count++;
calculate( (num%2) ? 3*num+1 : num/2);
return ;
}

int main(){
// freopen("input.txt","r",stdin);
int integer1=0,integer2=0,i=0,max=0,temp=0;

while(scanf("%d%d",&integer1,&integer2)!=EOF)
{
    if(integer1>integer2){
        temp=integer1;
        integer1=integer2;
        integer2=temp;
    }
    for(i=integer1;i<=integer2;i++){

    calculate(i);
    if(count>max) max=count;

    box[i]=count;
    count=0;
    }
    printf("%d %d %d\n",integer1,integer2,max);
    max=0;

}

    calculate(i);
    if(count>max) max=count;

    box[i]=count;
    count=0;
return 0;

}

3个回答

u013596119
u013596119   Rxr 2016.03.06 21:34

可能数组太大越界了?

u013596119
u013596119   Rxr 2016.03.06 21:43

输入 1 1000000,越界了

luochoudan
luochoudan   Ds   Rxr 2016.03.06 23:26

访问无效内存空间?不太好看,debug一下。

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