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38 lines
578 B
38 lines
578 B
package class01;
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public class Code02_SumOfFactorial {
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public static long f1(int N) {
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long ans = 0;
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for (int i = 1; i <= N; i++) {
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ans += factorial(i);
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}
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return ans;
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}
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public static long factorial(int N) {
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long ans = 1;
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for (int i = 1; i <= N; i++) {
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ans *= i;
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}
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return ans;
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}
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public static long f2(int N) {
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long ans = 0;
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long cur = 1;
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for (int i = 1; i <= N; i++) {
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cur = cur * i;
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ans += cur;
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}
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return ans;
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}
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public static void main(String[] args) {
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int N = 10;
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System.out.println(f1(N));
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System.out.println(f2(N));
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}
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}
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