You are given three integers aa, bb and xx. Your task is to construct a binary string ss of length n=a+bn=a+bsuch that there are exactly aa zeroes, exactly bb ones and exactly xx indices ii (where 1≤i<n1≤i<n) such that si≠si+1si≠si+1. It is guaranteed that the answer always exists.
For example, for the string "01010" there are four indices ii such that 1≤i<n1≤i<n and si≠si+1si≠si+1 (i=1,2,3,4i=1,2,3,4). For the string "111001" there are two such indices ii (i=3,5i=3,5).
Recall that binary string is a non-empty sequence of characters where each character is either 0 or 1.
Input
The first line of the input contains three integers aa, bb and xx (1≤a,b≤100,1≤x<a+b)1≤a,b≤100,1≤x<a+b).
Output
Print only one string ss, where ss is any binary string satisfying conditions described above. It is guaranteed that the answer always exists.
Examples
Input
2 2 1
Output
1100
Input
3 3 3
Output
101100
Input
5 3 6
Output
01010100
Note
All possible answers for the first example:
- 1100;
- 0011.
All possible answers for the second example:
- 110100;
- 101100;
- 110010;
- 100110;
- 011001;
- 001101;
- 010011;
- 001011.
题意:
给定 a 个0, b 个1 组成一个 n=a+b 的字符串,需要有 x 个下标满足 Sx!=Sx+1 的条件
例如 1010000 x 是由下标 0,1,2(数组从0 开始的)组成的,满足上述的条件
思路:
需要构造和思维,按照题意构造出来符合题意的即可
做法:
先从开始按 1,0 交错的顺序构造出 x -1 个不同的,然后在结尾把剩余的给输出同时需要再构造出来一个前后不同的
例如 构造好前 x-1 个是 101010 ,还剩下 3个1,5个0,还需要再构造出来一个不同的,就是 10101000000111
如果 1的个数 大于 0 的个数,则先输出 1,否则相反
Code:
#include<iostream>
#include<cmath>
#include<cstdlib>
#include<cstring>
#include<algorithm>
#include<queue>
#include<stack>
#include<vector>
#include<cstdio>
#include<cstdlib>
using namespace std;
int main()
{
int a,b,x,n;
char ans[205];
scanf("%d %d %d",&a,&b,&x);
if(a>b){
a--;
ans[0]='0';
}
else{
b--;
ans[0]='1';
}
int flag=1;
while(x>1)
{
x--;
if(ans[flag-1]=='1')
{
ans[flag++]='0';
a--;
}
else{
ans[flag++]='1';
b--;
}
}
if(ans[flag-1]=='1')
{
while(b--)
ans[flag++]='1';
while(a--)
ans[flag++]='0';
}
else
{
while(a--)
ans[flag++]='0';
while(b--)
ans[flag++]='1';
}
ans[flag]='\0';
printf("%s\n",ans);
}