Metaseniornov. de 2025
Target Sum: Given an array of integers and a target sum, find the number of ways to assign + and - signs to the integers so that the sum of the resulting expression equals the target sum.
Count how many ways to assign +/− to each element of nums so the signed sum equals target. This reduces to a subset-sum problem: count subsets with sum (sum(nums)+target)/2 (must be integral and nonnegative), typically solved with DP — watch parity and zeros.
Use esses exemplos para entender em que contexto ela costuma cair e adaptar sua prática.
Target Sum: Given an array of integers and a target sum, find the number of ways to assign + and - signs to the integers so that the sum of the resulting expression equals the target sum.
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