結果
| 問題 |
No.2019 Digits Filling for All Substrings
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2022-02-07 08:00:21 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 173 ms / 2,000 ms |
| コード長 | 3,808 bytes |
| コンパイル時間 | 2,025 ms |
| コンパイル使用メモリ | 78,600 KB |
| 実行使用メモリ | 55,008 KB |
| 最終ジャッジ日時 | 2024-06-12 01:41:20 |
| 合計ジャッジ時間 | 6,405 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 30 |
ソースコード
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.NoSuchElementException;
class Main {
public static void main(String[] args) {
new Main().run();
}
final long mod=998244353;
long f(char[] a, int id) {
int n=a.length;
if (id == n) {
int sum=0;
for (char c : a) {
sum+=c-'0';
}
if (sum%3==0) return 1;
else return 0;
}
long ret=0;
if (a[id]=='?') {
a[id]='0';
ret+=4*f(a, id+1);
ret%=mod;
a[id]='1';
ret+=3*f(a, id+1);
ret%=mod;
a[id]='2';
ret+=3*f(a, id+1);
ret%=mod;
a[id]='?';
} else {
ret=f(a, id+1);
}
return ret;
}
void brute(int N, char[] str) {
long ans=0;
for (int L=0;L<N;++L) {
for (int R=L;R<N;++R) {
ans+=f(Arrays.copyOfRange(str, L, R+1), 0);
ans%=mod;
}
}
System.out.println(ans);
}
void solve() {
FastScanner sc=new FastScanner();
PrintWriter pw=new PrintWriter(System.out);
int N=sc.nextInt();
char[] str=sc.next().toCharArray();
//brute(N, str);
long[] cnt=new long[3];
cnt[0]=0;
long ans=0;
for (int i=0;i<N;++i) {
long[] ncnt=new long[3];
for (int pre=0;pre<3;++pre) {
for (int add=0;add<=9;++add) {
if (str[i]!='?' && add != str[i]-'0') continue;
ncnt[(pre+add)%3]+=cnt[pre];
ncnt[(pre+add)%3]%=mod;
}
}
for (int add=0;add<=9;++add) {
if (str[i]!='?' && add != str[i]-'0') continue;
ncnt[add%3]++;
ncnt[add%3]%=mod;
}
ans=(ans+ncnt[0])%mod;
cnt=ncnt;
}
System.out.println(ans);
pw.close();
}
void run() {
solve();
}
static void tr(Object...objects) {
System.out.println(Arrays.deepToString(objects));
}
}
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());}
}