kyopro_educational_90_swift/008.swift at main · samekard-dev/kyopro_educational_90_swift · GitHub

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
func readInt() -> Int {
    Int(readLine()!)!
}

let ten_nine_seven = 1000000000 + 7

 //atcoder方式
 let count = readInt()
 let s = Array(readLine()!)

/*
//E869120方式
let s = Array(readLine()!)
let count = s.count
 */

var aSum = 0
var tSum = 0
var cSum = 0
var oSum = 0
var dSum = 0
var eSum = 0
var rSum = 0

for i in 0..<count {
    switch s[i] {
        case "a":
            aSum += 1
        case "t":
            tSum += aSum
            tSum %= ten_nine_seven
        case "c":
            cSum += tSum
            cSum %= ten_nine_seven
        case "o":
            oSum += cSum
            oSum %= ten_nine_seven
        case "d":
            dSum += oSum
            dSum %= ten_nine_seven
        case "e":
            eSum += dSum
            eSum %= ten_nine_seven
        case "r":
            rSum += eSum
            rSum %= ten_nine_seven
        default:
            break
    }
}
print(rSum)