OJ-Problems-Source/HDOJ/4995_autoAC.cpp
2016-09-10 11:34:41 +08:00

67 lines
1.7 KiB
C++

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <map>
using namespace std;
const int N = 1e5 + 5;
typedef long long ll;
map<int, int> vis;
int T, n, m, k;
struct Node {
ll x;
double v;
int id;
}node[N];
int cmp (const Node &a, const Node &b) {
return a.x < b.x;
}
double solve () {
double ans = 0;
vis.clear();
sort (node, node + n, cmp);
for (int i = 0; i < n; i++)
vis[node[i].id] = i;
int pos, tmp;
int num;
for (int i = 0; i < m; i++) {
scanf ("%d", &num);
pos = vis[num - 1];
int p1 = pos - 1;
int p2 = pos + 1;
double sum = 0;
tmp = 0;
while (tmp < k) {
if (p1 == -1)
sum += node[p2++].v;
else if (p2 == n)
sum += node[p1--].v;
else {
if (node[pos].x - node[p1].x < node[p2].x - node[pos].x)
sum += node[p1--].v;
else if (node[pos].x - node[p1].x > node[p2].x - node[pos].x)
sum += node[p2++].v;
else if (node[p1].id < node[p2].id)
sum += node[p1--].v;
else
sum += node[p2++].v;
}
tmp++;
}
ans += sum / k;
node[pos].v = sum / k;
}
return ans;
}
int main () {
scanf ("%d", &T);
while (T--) {
scanf ("%d%d%d", &n, &m, &k);
for (int i = 0; i < n; i++) {
scanf ("%I64d%lf", &node[i].x, &node[i].v);
node[i].id = i;
}
printf ("%.6lf\n", solve());
}
return 0;
}