Submission #18,877

2025-11-07 17:59:07

python3

Accepted 75/75

75ms

7856 KiB

N = int(input())
dns = input()
T = [0]
t = 0
A = [0]
a = 0
for b in dns:
    if b == "T":
        t += 1
    T.append(t)
    if b == "A":
        a += 1
    A.append(a)
db = 0
i = 0
while i < N:
    if dns[i] == "A":
        j = i + 1
        while j < N and dns[j] != "G":
            j += 1
        db += (A[j] - A[i])*(T[N] - T[j])
        i = j + 1
    else:
        i += 1
print(db)

	Sum	Test	Verdict		Time	Memory
base	75/75
		1	Accepted	0/0	16ms	3112 KiB
		2	Accepted	0/0	72ms	6292 KiB
		3	Accepted	3/3	16ms	3116 KiB
		4	Accepted	4/4	16ms	3120 KiB
		5	Accepted	4/4	16ms	3312 KiB
		6	Accepted	4/4	17ms	2984 KiB
		7	Accepted	4/4	16ms	3124 KiB
		8	Accepted	3/3	16ms	2984 KiB
		9	Accepted	3/3	16ms	3020 KiB
		10	Accepted	4/4	16ms	3064 KiB
		11	Accepted	4/4	17ms	3124 KiB
		12	Accepted	4/4	17ms	3124 KiB
		13	Accepted	4/4	16ms	2984 KiB
		14	Accepted	4/4	16ms	2984 KiB
		15	Accepted	3/3	71ms	6156 KiB
		16	Accepted	4/4	67ms	7516 KiB
		17	Accepted	4/4	59ms	5400 KiB
		18	Accepted	4/4	64ms	7544 KiB
		19	Accepted	4/4	75ms	7832 KiB
		20	Accepted	4/4	68ms	7836 KiB
		21	Accepted	3/3	68ms	7856 KiB
		22	Accepted	4/4	65ms	7756 KiB