algorithms
코드포스 (codeforces)
코드포스 451B (codeforces 451B)
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코드포스 451B (codeforces 451B) 문제 풀이 및 코드 (description and code)
Problem - 451B - Codeforces
코드
import java.io.*;
import java.util.Arrays;
public class CF451B {
static int n, a[] = new int[100001], b[] = new int[100001], si, ei;
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
n = Integer.parseInt(br.readLine());
String ins[] = br.readLine().split(" ");
for (int i = 1; i <= n; i++) {
a[i] = Integer.parseInt(ins[i - 1]);
}
System.arraycopy(a, 0, b, 0, n + 1);
Arrays.sort(a, 1, n + 1);si = 1;ei = n;
boolean s = false, e = false, is;
for (int i = 1; i < n; i++) {
if (!s && b[i] >= b[i + 1]) {
s = true;si = i;
}
if (s && b[i] < b[i + 1]) {
e = true;ei = i;break;
}
}
if (s) {
for (int i = si; i <= ((si + ei) >> 1); i++) {
int tmp = b[i];
b[i] = b[(si + ei) - i];
b[(si + ei) - i] = tmp;
}
}else ei = si;
boolean sorted = true;
for (int i = 1; i <= n; i++) {
if (a[i] != b[i]) {
sorted = false;break;
}
}
StringBuffer sb = new StringBuffer();
sb.append((sorted) ? "yes\n" : "no\n");
sb.append((sorted) ? si + " " + ei + "\n" : "");
bw.write(sb.toString());
bw.flush();bw.close();
}
}
