結果
問題 | No.910 素数部分列 |
ユーザー |
|
提出日時 | 2019-10-18 23:23:15 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 321 ms / 1,000 ms |
コード長 | 5,057 bytes |
コンパイル時間 | 2,636 ms |
コンパイル使用メモリ | 78,804 KB |
実行使用メモリ | 49,632 KB |
最終ジャッジ日時 | 2024-06-25 21:55:22 |
合計ジャッジ時間 | 13,744 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 50 |
ソースコード
import java.util.*;import java.io.*;public class Main {static long mod = 998244353;static int INF = 1000000000;public static void main(String[] args){FastScanner scanner = new FastScanner();int n = scanner.nextInt();String s = scanner.next();int ans = 0;for(int i = 0; i < n; i++){if(s.charAt(i) == '3' ||s.charAt(i) == '5' || s.charAt(i) == '7'){ans++;}}PriorityQueue<Integer> one = new PriorityQueue<Integer>();PriorityQueue<Integer> nine = new PriorityQueue<Integer>();for(int i = 0; i < n; i++){if(s.charAt(i) == '1'){one.add(i);}else if(s.charAt(i) == '9'){nine.add(i);}}int remn = 0;while(!one.isEmpty() && !nine.isEmpty()){int onetop = one.peek();int ninetop = nine.peek();if(ninetop < onetop){nine.poll();remn++;}else if(onetop < ninetop){one.poll();nine.poll();ans++;}}int a = one.size();int b = remn;while(a >= 1 && b >= 2){a -= 1;b -= 2;ans++;}ans += a/2;System.out.println(ans);}static class BIT{int n;int[] bit;public BIT(int n){this.n = n;bit = new int[n+1];}void add(int idx, int val){for(int i = idx+1; i <= n; i += i&(-i)) bit[i-1] += val;}int sum(int idx){int res = 0;for(int i = idx+1; i > 0; i -= i&(-i)) res += bit[i-1];return res;}int sum(int begin, int end){if(begin == 0) return sum(end);return sum(end)-sum(begin-1);}}static class Pair implements Comparable<Pair>{int first, second;Pair(int a, int b){first = a;second = b;}@Overridepublic boolean equals(Object o){if (this == o) return true;if (!(o instanceof Pair)) return false;Pair p = (Pair) o;return first == p.first && second == p.second;}@Overridepublic int compareTo(Pair p){//return first == p.first ? second - p.second : first - p.first; //firstで昇順にソート//return (first == p.first ? second - p.second : first - p.first) * -1; //firstで降順にソート//return second == p.second ? first - p.first : second - p.second;//secondで昇順にソート//return (second == p.second ? first - p.first : second - p.second)*-1;//secondで降順にソート//return first * 1.0 / second > p.first * 1.0 / p.second ? 1 : -1; // first/secondの昇順にソート//return first * 1.0 / second < p.first * 1.0 / p.second ? 1 : -1; // first/secondの降順にソート//return second * 1.0 / first > p.second * 1.0 / p.first ? 1 : -1; // second/firstの昇順にソート//return second * 1.0 / first < p.second * 1.0 / p.first ? 1 : -1; // second/firstの降順にソート//return Math.atan2(second, first) > Math.atan2(p.second, p.first) ? 1 : -1; // second/firstの昇順にソート//return first + second > p.first + p.second ? 1 : -1; //first+secondの昇順にソート//return first + second < p.first + p.second ? 1 : -1; //first+secondの降順にソート//return first - second < p.first - p.second ? 1 : -1; //first-secondの降順にソートreturn Math.atan2(second,first) > Math.atan2(p.second, p.first) ? 1 : -1;}}private static class FastScanner {private final 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;}public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; 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() {long nl = nextLong();if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();return (int) nl;}public double nextDouble() { return Double.parseDouble(next());}}}