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Answers and rating deltas for

What does ++letter[c - 'A']; mean in this C program?

Author Votes Δ
ikegami 4 +0.80
user3629249 3 +1.76
Vlad from Moscow 2 -0.12
Roberto Caboni 2 +0.46
Amitoz singh 1 -2.71
Barmar 1 -1.79
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