哈哈哈哈

#include<bits/stdc++.h>

#include<iostream>

#define db long double

usingnamespacestd;

structsd{db v,w,t;};

constintM=55;

intn;

db totw,le,ri,mid,u,t;

sd riv[M];

db sqr(db x){returnx*x;}

voidin()

{

    scanf("%d%Lf%Lf",&n,&u,&t);

    for(inti=1;i<=n;++i)

    scanf("%Lf%Lf",&riv[i].w,&riv[i].v),totw+=riv[i].w,le=max(le,riv[i].v);

}

db check(db x)

{

    db r=0,hh;

    for(inti=1;i<=n;++i)

    {

        hh=(x-riv[i].v)*(x-riv[i].v);

        riv[i].t=sqrt((hh*sqr(riv[i].w))/(hh*sqr(u)-sqr(u)*sqr(u)));

        r+=riv[i].t;

    }

    returnr;

}

voidac()

{

    le+=u;ri=1e12;

    if(totw/u>t)printf("-1"),exit(0);

    for(inti=1;i<=5000;++i)

    {

        mid=(le+ri)*0.5;

        if(check(mid)>=t)le=mid;

        elseri=mid;

    }

    check(le);

    db toth=0;

    for(inti=1;i<=n;++i)toth+=sqrt(sqr(u*riv[i].t)-sqr(riv[i].w))+riv[i].v*riv[i].t;

    printf("%.3Lf\n",sqrt(sqr(totw)+sqr(toth)));

    for(inti=1;i<=n;++i)printf("%.3Lf ",riv[i].t);

}

intmain()

{

    in();ac();

    return0;

}