Eliminate N-1 redundant calls to solveVars() where N is the array length. Benchmark results show significant improvements across all array sizes:

Execution Time

• Small arrays (10 elements): -23.47% (9.3µs → 7.1µs)
• Medium arrays (100 elements): -31.80% (75.2µs → 51.3µs)
• Large arrays (1000 elements): -31.24% (398.8µs → 274.2µs)

Memory Usage

• Small arrays: -32.80% (19.5 KiB → 13.1 KiB)
• Medium arrays: -44.24% (159.2 KiB → 88.8 KiB)
• Large arrays: -43.61% (815.5 KiB → 459.8 KiB)

Allocations

• Small arrays: -24.11% (224 → 170 allocs/op)
• Medium arrays: -32.16% (1847 → 1253 allocs/op)
• Large arrays: -29.79% (10069 → 7069 allocs/op)

How to reproduce:

$ cd benchmark && ./bench v3.8.7 BenchmarkArrayOperationsScaling