提出 #17623071

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ソースコード 拡げる

import sys

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

def main(N, M):
    if N == 1 and M == 0:
        print(1, 2)
        return
    if not 0 <= M < N - 1:
        print(-1)
        return
    if M == 0:
        for i in range(N):
            print(2 * i + 1, 2 * i + 2)
        return
    X = 10**6
    for i in range(M + 1):
        print(X + 2 * i + 1, X + 2 * i + 2)
    for i in range(N - M - 1):
        print(X - i - 1, X + X + i + 1)

N, M = map(int, readline().split())

main(N, M)

提出情報

ジャッジ結果