-
Notifications
You must be signed in to change notification settings - Fork 1
/
making_candies.go
94 lines (76 loc) · 1.65 KB
/
making_candies.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
package main
import (
"bufio"
"fmt"
"math"
"math/big"
"os"
)
func minimumPasses(machines int64, workers int64, price int64, target int64) int64 {
if new(big.Int).Mul(big.NewInt(machines), big.NewInt(workers)).Cmp(big.NewInt(target)) >= 0 {
return 1
}
var left int64 = 1
var right int64 = math.MaxInt64
for left < right {
passes := left + (right-left)>>1
if check(machines, workers, price, target, passes) {
right = passes
} else {
left = passes + 1
}
}
return left
}
func check(machines int64, workers int64, price int64, target int64, passes int64) bool {
// if machines >= (target+workers-1)/workers {
// return true
// }
candies := machines * workers
passes--
for {
rounds := (target - candies + machines*workers - 1) / (machines * workers)
if rounds <= passes {
return true
}
if candies < price {
rounds = (price - candies + machines*workers - 1) / (machines * workers)
passes -= rounds
if passes < 1 {
break
}
candies += rounds * machines * workers
}
candies -= price
if machines > workers {
workers++
} else {
machines++
}
}
return false
}
func main() {
stdin, err := os.Open(os.Getenv("INPUT_PATH"))
if err != nil {
stdin = os.Stdin
}
defer stdin.Close()
stdout, err := os.Create(os.Getenv("OUTPUT_PATH"))
if err != nil {
stdout = os.Stdout
}
defer stdout.Close()
reader := bufio.NewReaderSize(stdin, 1024*1024)
writer := bufio.NewWriterSize(stdout, 1024*1024)
var m, w, p, n int64
fmt.Fscan(reader, &m, &w, &p, &n)
answer := minimumPasses(m, w, p, n)
fmt.Fprint(writer, answer)
writer.Flush()
}
func checkError(err error) {
if err != nil {
panic(err)
}
}