3SUM

size, target = map(int, input().split())
nums = list(map(int, input().split()))

arr = sorted([(nums[i], i + 1) for i in range(size)])

for i in range(size):
    a = target - arr[i][0]
    curr_target = target - a
    left, right = i + 1, size - 1
    while left < right:
        curr = arr[left][0] + arr[right][0]
        if curr == a:
            ans = [arr[i][1], arr[left][1], arr[right][1]]
            print(*ans)
            quit()
        if curr < a:
            left += 1
        else:
            right -= 1
print("IMPOSSIBLE")

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: TIME LIMIT EXCEEDED

Test 11

Verdict: TIME LIMIT EXCEEDED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: TIME LIMIT EXCEEDED

Test 14

Verdict: TIME LIMIT EXCEEDED

Test 15

Verdict: TIME LIMIT EXCEEDED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: TIME LIMIT EXCEEDED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: TIME LIMIT EXCEEDED

Test 22

Verdict: TIME LIMIT EXCEEDED

Test 23

Verdict: ACCEPTED