hash map으로 index 저장해뒀다가 query 들어오면 반환 import sys input = sys.stdin.readline a_idx = {} N, M = map(int, input().split()) A = sorted([int(input()) for _ in range(N)]) for i in range(N): if A[i] not in a_idx: a_idx[A[i]] = i D = [int(input()) for _ in range(M)] for num in D: if num in a_idx: print(a_idx[num]) else: print(-1)