实数二分+前缀和维护

调了一晚上， 但发现没什么注意事项orz

无输出只因eps定义成了int型QAQ哭唧唧

#include
     
      #include
      
       using namespace std;const int sz = 100010;double eps = 1e-5;int n, f;double a[sz], b[sz], sum[sz];bool check(double k) {    double minn = 1e10, ans = -1e10;    for(int i = 1; i <= n; i++)        b[i] = a[i] - k;    for(int i = 1; i <= n; i++)        sum[i] = sum[i-1] + b[i];    for(int i = f; i <= n; i++) {        minn = min(minn, sum[i - f]);        ans = max(ans, sum[i] - minn);     }     if(ans >= 0) return true;     else return false;}int main() {    scanf("%d%d", &n, &f);        for(int i = 1; i <= n; i++)        scanf("%lf", &a[i]);    double l = -1e6, r = 1e6, ans = 0;    while(r - l > eps) {        double mid = (l + r) / 2.0;        if(check(mid)) l = mid;        else r = mid;    }    cout<< int(r * 1000) <