http://www.lydsy.com/JudgeOnline/problem.php?id=2709
可以看出s到e的最短路关于v单调不减
二分v做最短路好了
注意精度,要卡到1e-7
program bzoj2709;
const
eps=1e-7;
zl:array [1..4,1..2] of longint=((1,0),(-1,0),(0,1),(0,-1));
var
p,l,v,s,e:double;
t,x,y,tot,sx,sy,ex,ey,r,c,i,j,k:longint;
dis:array [0..101,0..101] of double;
map:array [0..101,0..101] of char;
dl:array [0..1000001] of record
x,y:longint;
......
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