Multiply Strings

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Solution Guide: Multiply Strings

Approach

Use an integer array to store partial products by place value, like manual multiplication. Accumulate products and carries at the correct indices.

Complexity Analysis

Time
O(n * m)
Space
O(n + m)

Pattern

Digit Simulation

Why It Works

Each digit pair contributes to a fixed place-value slot. Summing and carrying in that slot-by-slot structure reproduces exact integer multiplication.

Updated Feb 2026