http://codeforces.com/contest/761/problem/B

题意:

有一个长度为l的环形跑道,跑道上有n个障碍,现在有2个人,给出他们每过多少米碰到障碍,判断他们跑的是不是同一个跑道。

思路:

如果是同一个跑道,那么障碍与障碍之间的距离是相同的。

所以我们可以先计算出两个人的跑道的障碍之间的距离,然后暴力比较,如果全部一样就是同一个跑道(因为是环形跑道,所以在比较的时候每次都需要将第一个加到最后)。

 #include<iostream>
#include<string>
#include<cstring>
#include<algorithm>
#include<queue>
#include<cstdio>
using namespace std; int n,l;
int a[],b[];
int A[],B[*]; int main()
{
//freopen("D:\\input.txt", "r", stdin);
while(~scanf("%d%d",&n,&l))
{
for(int i=;i<n;i++) scanf("%d",&a[i]);
for(int i=;i<n;i++) scanf("%d",&b[i]); int sum=;
for(int i=;i<n;i++)
{
A[i-]=a[i]-a[i-];
sum+=a[i]-a[i-];
}
A[n-]=l-sum; sum=;
for(int i=;i<n;i++)
{
B[i-]=b[i]-b[i-];
sum+=b[i]-b[i-];
}
B[n-]=l-sum; bool flag=false;
for(int t=;t<n;t++)
{
for(int i=;i<n;i++)
{
if(A[i]!=B[(i+t)%n]) break;
if(i==n-) flag=true;
}
if(flag) break;
}
if(flag) puts("YES");
else puts("NO");
}
return ;
}

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