public class SumOfInteger { public static void main(String[] args) { int n = 100; int sum = 0; for (int i = 0; i < n + 1; i++) { sum += i; } System.out.println(sum); } }
按公式处理,兄弟!
// TODO: sum = 1 + 2 + ... + n
int sum = ((1+n)*n)/2;
六个手指头,兄弟!
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都说有我就有趣