結果
問題 | No.713 素数の和 |
ユーザー |
![]() |
提出日時 | 2019-02-21 03:24:29 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 53 ms / 2,000 ms |
コード長 | 3,035 bytes |
コンパイル時間 | 2,324 ms |
コンパイル使用メモリ | 77,372 KB |
実行使用メモリ | 36,676 KB |
最終ジャッジ日時 | 2024-11-08 19:27:30 |
合計ジャッジ時間 | 3,362 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 6 |
ソースコード
import java.io.IOException; import java.util.NoSuchElementException; public class Main{ public static void main(String[] args){ FastScanner sc = new FastScanner(); int N = sc.nextInt(); int ans = 0; for(int i=2;i<=N;i++){ if(isPrime(i)){ ans += i; } } System.out.println(ans); } private static boolean isPrime(int i) { for(int j=2;j*j<=i;j++){ if(i%j==0){ return false; } } return true; } } class FastScanner { private final java.io.InputStream in = System.in; private final byte[] buffer = new byte[1024]; private int ptr = 0; private int buflen = 0; private boolean hasNextByte() { if (ptr < buflen) { return true; }else{ ptr = 0; try { buflen = in.read(buffer); } catch (IOException e) { e.printStackTrace(); } if (buflen <= 0) { return false; } } return true; } private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;} private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;} private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;} public boolean hasNext() { skipUnprintable(); return hasNextByte();} public String next() { if (!hasNext()) throw new NoSuchElementException(); StringBuilder sb = new StringBuilder(); int b = readByte(); while(isPrintableChar(b)) { sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } public long nextLong() { if (!hasNext()) throw new NoSuchElementException(); long n = 0; boolean minus = false; int b = readByte(); if (b == '-') { minus = true; b = readByte(); } if (b < '0' || '9' < b) { throw new NumberFormatException(); } while(true){ if ('0' <= b && b <= '9') { n *= 10; n += b - '0'; }else if(b == -1 || !isPrintableChar(b)){ return (minus ? -n : n); }else{ throw new NumberFormatException(); } b = readByte(); } } public int nextInt() { if (!hasNext()) throw new NoSuchElementException(); long n = 0; boolean minus = false; int b = readByte(); if (b == '-') { minus = true; b = readByte(); } if (b < '0' || '9' < b) { throw new NumberFormatException(); } while(true){ if ('0' <= b && b <= '9') { n *= 10; n += b - '0'; }else if(b == -1 || !isPrintableChar(b)){ return (int) (minus ? -n : n); }else{ throw new NumberFormatException(); } b = readByte(); } } }