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Problem Bank · inv-3

Invariants & Monovariants · ParityOlympiad classic●●●●○ 7/10~5 min⏱ 0:00
Signs ++ or −- are placed between the numbers 1,2,…,101, 2, \ldots, 10. What is the smallest nonnegative value the resulting expression can take?
paritysigned-sums