Problem Solving►UVa

UVa 913 - Joana and the Odd Numbers

Contents

  1. 1. Problem
  2. 2. Solution
  3. 3. Code

Problem

中文網址

Solution

如下。

Code

UVa 913
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#include<cstdio>

int main() {

    long long n, i, sum;
    while (scanf("%lld", &n) != EOF)
    {
        i = (1 + n)*(n / 2 + 1) / 2;//總共有幾個奇數
        sum = 3 * (1 + 2 * (i - 2));//最後 3 個相加 = 中間那個 * 3
        printf("%lld\n", sum);
    }
    return 0;
}