Intervals (2)

Write a program that, given two intervals, tells if one is inside the
other.

Input

Input consists of four integer numbers a₁, b₁, a₂, b₂ that represent the
intervals [a₁, b₁] and [a₂, b₂]. Assume a₁ ≤ b₁ and a₂ ≤ b₂.

Output

Print ‘=’ if the intervals are equal, ‘1’ if the first is inside the
second (but they are not equal), ‘2’ if the second is inside the first
(but they are not equal), or ‘?’ otherwise.

Problem information

Author: Unknown
Translator: Carlos Molina

Generation: 2026-01-25T11:48:20.174Z

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