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changechar.java
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38 lines (37 loc) · 1.27 KB
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import java.util.Scanner;
public class changechar {
public static int minFlipsMonoIncr(String s) {
//0不能出现在1后面;
//翻转前面还是反转后面
//找到逆序对;
//对于每一个数，记录前面为1，记录后面为0的dp
int len=s.length();
int min=len;
int[][] dp=new int[len][2];
if (s.charAt(0)=='1')dp[0][1]=1;
if (s.charAt(len-1)=='0')dp[len-1][0]=1;
for(int i=1;i<len;i++){
if (s.charAt(i)=='1')
dp[i][1]=dp[i-1][1]+1;
else dp[i][1]=dp[i-1][1];
System.out.println(dp[i][1]);
}
for(int i=len-2;i>=0;i--){
if (s.charAt(i)=='0')
dp[i][0]=dp[i+1][0]+1;
else dp[i][0]=dp[i+1][0];
}
for(int i=0;i<len;i++){
dp[i][0]=dp[i][0]+dp[i][1];
min=Math.min(dp[i][0],min);
}
return min-1;
}
public static void main(String[] args){
try (Scanner input = new Scanner(System.in)) {
String str = input.next();
// str="11111110000000000";
System.out.println(minFlipsMonoIncr(str));
}
}
}