1. Selected dates can't be greater than July 2026. 2. From date can't be greater than To date. 1. Selected dates can't be greater than July 2026. 2. From date can't be greater than To date. 1. From & ...
// Approach: For each i, count pairs whose gcd is a multiple of i, then sweep downward subtracting // multiples to get exact-gcd counts; prefix sum them and binary search each query's rank.
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