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题目来源：码蹄集
https://matiji.net/exam/brushquestion/326/778/B3FCFEC101BD05189BB74D522E019504
参考程序：
#include <iostream>
#define N 10000
int main() {char s[N];int n;scanf("%d", &n);scanf("%s", s);int high = n-1, low = 0;while(high > low) {if (s[low] == '0' && s[high] == '0') {++low;} else if (s[low] == '1' && s[high] == '1') {--high;} else if (s[low] == '1' && s[high] == '0') {char tmp = s[low];s[low] = s[high];s[high] = tmp;--high;++low;} else{--high;++low;}}printf("%s\n", s);return 0;
}
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