0990. Satisfiability of Equality Equations
https://leetcode.com/problems/satisfiability-of-equality-equations
Description
You are given an array of strings equations
that represent relationships between variables where each string equations[i]
is of length 4
and takes one of two different forms: "xi==yi"
or "xi!=yi"
.Here, xi
and yi
are lowercase letters (not necessarily different) that represent one-letter variable names.
Return true
if it is possible to assign integers to variable names so as to satisfy all the given equations, or false
otherwise.
Example 1:
**Input:** equations = ["a==b","b!=a"]
**Output:** false
**Explanation:** If we assign say, a = 1 and b = 1, then the first equation is satisfied, but not the second.
There is no way to assign the variables to satisfy both equations.
Example 2:
**Input:** equations = ["b==a","a==b"]
**Output:** true
**Explanation:** We could assign a = 1 and b = 1 to satisfy both equations.
Example 3:
**Input:** equations = ["a==b","b==c","a==c"]
**Output:** true
Example 4:
**Input:** equations = ["a==b","b!=c","c==a"]
**Output:** false
Example 5:
**Input:** equations = ["c==c","b==d","x!=z"]
**Output:** true
Constraints:
1 <= equations.length <= 500
equations[i].length == 4
equations[i][0]
is a lowercase letter.equations[i][1]
is either'='
or'!'
.equations[i][2]
is'='
.equations[i][3]
is a lowercase letter.
ac
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