uva 11627

二分

#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <vector>
#include <sstream>
#include <string>
#include <cstring>
#include <algorithm>
#include <iostream>
#define maxn 100010
#define INF 0x7fffffff
#define inf 10000000
#define MOD 1000000007
#define ull unsigned long long
#define ll long long
using namespace std;
 
struct node
{
    int x, y;
};
 
node houge[maxn];
int n, v, w, s[maxn*10], m;
 
bool ok(int mid)
{
    double st = houge[0].x, en = houge[0].x+w;
    for(int i = 1; i < n; ++ i)
    {
        double len = (double)(houge[i].y-houge[i-1].y)/s[mid]*v;
        st -= len;
        en += len;
        st = max(st, (double)houge[i].x);
        en = min(en, (double)houge[i].x+w);
        if(st > en+1e-6) return false;
 
    }
    return true;
}
 
int solve()
{
    int ans = -1;
    int rig = 0, le = m;
    while(rig < le)
    {
        int mid = rig + (le-rig)/2;
        if(ok(mid))
        {
            rig = mid+1;
            ans = mid;
        }
        else le = mid;
    }
    return ans;
}
 
int main()
{
    int t;
    scanf("%d", &t);
    while(t --)
    {
        scanf("%d%d%d", &w, &v, &n);
        for(int i = 0; i < n; ++ i) scanf("%d%d", &houge[i].x, &houge[i].y);;
        scanf("%d", &m);
        for(int i = 0; i < m; ++ i) scanf("%d", &s[i]);
        sort(s, s+m);
        int ans = solve();
        if(ans != -1) printf("%d\n", s[ans]);
        else puts("IMPOSSIBLE");
    }
    return 0;
}