39 lines
786 B
C++
39 lines
786 B
C++
#include<iostream>
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#include<algorithm>
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#include<cstring>
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using namespace std;
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const int MAX=250;
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int L;
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char s[MAX];
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int dp[MAX][1010];
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void gs()
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{
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int i,j;
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int tt=s[1]=='0'?0:1000;
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for(i=0;i<=1000;i++) dp[1][i]=(tt-i)*(tt-i);
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int small;
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for(i=2;i<=L;i++)
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{
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small=0x5fffffff;
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tt=s[i]=='0'?0:1000;
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for(j=0;j<=1000;j++)
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{
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if(small>dp[i-1][j]) small=dp[i-1][j];
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dp[i][j]=small+(tt-j)*(tt-j);
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}
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}
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}
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int main()
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{
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while(scanf("%s",s+1)==1)
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{
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L=strlen(s+1);
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gs();
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int ans=0x5fffffff;
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for(int i=0;i<=1000;i++) ans=min(ans,dp[L][i]);
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double aa=(double)ans/1000000;
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printf("%.3lf\n",aa);
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}
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return 0;
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}
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