标签:
10101
相当于排列组合的插空法,题目说不能有11,和001,那么我们可以这样考虑_1_1_1......在空的地方填0,
具体见代码注释
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<bits/stdc++.h>
using namespace std;
template<class T>inline T read(T&x)
{
char c;
while((c=getchar())<=32)if(c==EOF)return 0;
bool ok=false;
if(c=='-')ok=true,c=getchar();
for(x=0; c>32; c=getchar())
x=x*10+c-'0';
if(ok)x=-x;
return 1;
}
template<class T> inline T read_(T&x,T&y)
{
return read(x)&&read(y);
}
template<class T> inline T read__(T&x,T&y,T&z)
{
return read(x)&&read(y)&&read(z);
}
template<class T> inline void write(T x)
{
if(x<0)putchar('-'),x=-x;
if(x<10)putchar(x+'0');
else write(x/10),putchar(x%10+'0');
}
template<class T>inline void writeln(T x)
{
write(x);
putchar('\n');
}
//-------ZCC IO template------
const int maxn=1000001;
const double inf=999999999;
#define lson (rt<<1),L,M
#define rson (rt<<1|1),M+1,R
#define M ((L+R)>>1)
#define For(i,t,n) for(int i=(t);i<(n);i++)
typedef long long LL;
typedef double DB;
typedef pair<int,int> P;
#define bug printf("---\n");
#define mod 1000000007
int main()
{
//#ifndef ONLINE_JUDGE
//freopen("in.txt","r",stdin);
//freopen("zccccc.txt","w",stdout);
//#endif // ONLINE_JUDGE
int n,m,i,j,t,k;
while(read_(n,m))
{
if(m-n>=2||(n==0&&m==0))//1比0个数多于2个以上,那么无论怎么放0,肯定有11在一起,
puts("NO");
else if(m-n==1)//1比0 多一个,只能在1之间放0
{
For(i,0,(n+m)/2)
printf("10");
printf("1\n");
}
else if(n-m==1)//0比1多一个,在0之间放1
{
For(i,0,(n+m)/2)
printf("01");
printf("0\n");
}
else if(n==m)//相等就是01的循环
{
For(i,0,n)
printf("01");
printf("\n");
}
else//0比1多余1个,那么要避免001,就得把01尽可能的放在前面
{
For(i,0,m)
printf("01");
For(i,0,n-m)
printf("0");
printf("\n");
}
}
return 0;
}
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原文地址:http://blog.csdn.net/u013167299/article/details/45077523