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我是SB,超级SB.....WA的同学看看,你是不是也和我犯了一样SB的错误

Posted by cyb88 at 2010-02-27 15:36:51 on Problem 2499
   这道题用除法基本是没有问题的,注意四个if-else分支,基本就没问题了。大家请看我两个版本的差异:
错误版本:
#include <iostream>
using namespace std;

int main()
{
	int a,b,i,j,n,l,r;

	cin >> n;
	while(n--)
	{
		cin >> a >> b;
		l=r=0;
		while(!(a==1 && b==1))
		{
			//直接回溯到上一个转折节点
			if(a>b)
			{
				l += (a/b);
				if(a%b==0)
				{
					l--;
				}
				a = (a%b);
				if(b == 1)
				{
					a=1;
				}
			}
			else
			{
				r += (b/a);
				if(b%a==0)
				{
					r--;
				}
				b = (b%a);
				if(a == 1)
				{
					b=1;
				}
			}
		}
		j=1;
		cout << "Scenario #" << j++ << ":" << endl;
		cout << l << " " << r << endl << endl;
	}

	return 0;
}
正确版本:
#include <iostream>
using namespace std;

int main()
{
	int a,b,i,j,n,l,r;

	cin >> n;
	j=1;
	while(n--)
	{
		cin >> a >> b;
		l=r=0;
		while(!(a==1 && b==1))
		{
			//直接回溯到上一个转折节点
			if(a>b)
			{
				l += (a/b);
				if(a%b==0)
				{
					l--;
				}
				a = (a%b);
				if(b == 1)
				{
					a=1;
				}
			}
			else
			{
				r += (b/a);
				if(b%a==0)
				{
					r--;
				}
				b = (b%a);
				if(a == 1)
				{
					b=1;
				}
			}
		}
		cout << "Scenario #" << j++ << ":" << endl;
		cout << l << " " << r << endl << endl;
	}

	return 0;
}

看到为什么WA了么???
我也就在这里墨迹了1个多小时,WA了10多次而已.......恩,我是SB。大家尽情的BS我把~

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