結果

問題 No.910 素数部分列
ユーザー kitakitalily
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
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 50
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

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;
}
@Override
public 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;
}
@Override
public int compareTo(Pair p){
//return first == p.first ? second - p.second : first - p.first; //first
//return (first == p.first ? second - p.second : first - p.first) * -1; //first
//return second == p.second ? first - p.first : second - p.second;//second
//return (second == p.second ? first - p.first : second - p.second)*-1;//second
//return first * 1.0 / second > p.first * 1.0 / p.second ? 1 : -1; // first/second
//return first * 1.0 / second < p.first * 1.0 / p.second ? 1 : -1; // first/second
//return second * 1.0 / first > p.second * 1.0 / p.first ? 1 : -1; // second/first
//return second * 1.0 / first < p.second * 1.0 / p.first ? 1 : -1; // second/first
//return Math.atan2(second, first) > Math.atan2(p.second, p.first) ? 1 : -1; // second/first
//return first + second > p.first + p.second ? 1 : -1; //first+second
//return first + second < p.first + p.second ? 1 : -1; //first+second
//return first - second < p.first - p.second ? 1 : -1; //first-second
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());}
}
}
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