题解

3 条题解

  • 0

    前面的基本都能A 最后一个点tle,稍微加点优化就行了
    ```cpp
    #include<iostream>
    #include<cstring>
    #include<cstdio>
    #define N 500010
    #define inf 100000008
    using namespace std;

    int n;
    double k[N],s[N],u[N],Eu,v[N];

    bool check(double a,double b,int i){
    return 2.0*a*k[i]*b*b*(b-u[i])<=1.0?true:false;
    }

    double TwoPoint(int i,double lambda){
    double l=max(u[i],0.0),r=inf,mid;
    for(int j=1;j<=100;++j){
    mid=(l+r)/2;
    if(check(lambda,mid,i))l=mid;
    else r=mid;
    }
    return mid;
    }

    bool Check(double mid){
    double E=0;
    for(int i=1;i<=n;++i)v[i]=TwoPoint(i,mid);
    for(int i=1;i<=n;++i)E+=k[i]*s[i]*(v[i]-u[i])*(v[i]-u[i]);
    return E>=Eu;
    }

    int main(){
    scanf("%d",&n);
    scanf("%lf",&Eu);
    for(int i=1;i<=n;++i)
    scanf("%lf%lf%lf",&s[i],&k[i],&u[i]);
    double l=0.0,r=inf,mid;
    for(int j=1;j<=100;++j){
    mid=(l+r)/2;
    if(Check(mid))l=mid;
    else r=mid;
    }
    double ans=0;
    for(int i=1;i<=n;++i)
    ans+=s[i]/v[i];
    printf("%.8f\n",ans);
    return 0;
    }
    ```

  • -3
    @ 2016-11-16 12:25:12

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  • -3
    @ 2014-11-07 09:15:42

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  • 1

信息

ID
1805
难度
8
分类
(无)
标签
递交数
171
已通过
15
通过率
9%
被复制
2
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