+Algorithm complexity quantifies the resources, like time or memory, an [Algorithm](/wiki/Algorithm) requires to solve a problem. It describes how performance scales with input size, often expressed using [Big O notation](/wiki/Big_O_notation), guiding the selection of efficient solutions.
+## See also
+- [Time Complexity](/wiki/Time_Complexity)
+- [Space Complexity](/wiki/Space_Complexity)
+- [Data Structures](/wiki/Data_Structures)
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