Problem:
Score : 300 points

Problem Statement

Given is a permutation P_1, \ldots, P_N of 1, \ldots, N.
Find the number of integers i (1 \leq i \leq N) that satisfy the following condition:

For any integer j (1 \leq j \leq i), P_i \leq P_j.

Constraints

1 \leq N \leq 2 \times 10^5

P_1, \ldots, P_N is a permutation of 1, \ldots, N.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
P_1 ... P_N

Output

Print the number of integers i that satisfy the condition.

Sample Input 1

5
4 2 5 1 3

Sample Output 1

3

i=1, 2, and 4 satisfy the condition, but i=3 does not - for example, P_i > P_j holds for j = 1.

Similarly, i=5 does not satisfy the condition, either. Thus, there are three integers that satisfy the condition.

Sample Input 2

4
4 3 2 1

Sample Output 2

4

All integers i (1 \leq i \leq N) satisfy the condition.

Sample Input 3

6
1 2 3 4 5 6

Sample Output 3

1

Only i=1 satisfies the condition.

Sample Input 4

8
5 7 4 2 6 8 1 3

Sample Output 4

4

Sample Input 5

1
1

Sample Output 5

1

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Main {

    public static void main(String[] args) throws Exception {
        Scanner sn = new Scanner(System.in);
        Input input = InputParser.perse(sn, 2);
        sn.close();

        Integer n = input.getInt(1, 1);
        List<Integer> p = input.getIntLine(2);

        int min = p.get(0);
        int count = 1;
        for (int i = 1; i < p.size(); i++) {
            if (p.get(i) <= min) {
                count++;
                min = p.get(i);
            }
        }

        System.out.println(count);
    }

    private static class InputParser {
        static Input perse(Scanner sn, int line) {
            Input result = new Input();
            while (line-- > 0) {
                String[] args = sn.nextLine().split(" ");
                result.addAll(args);
            }
            return result;
        }
    }

    private static class Input {
        private Map<Integer, Map<Integer, String>> inputs;
        private int now = 1;
        private int innerNext = 1;

        Input() {
            inputs = new HashMap<>();
            inputs.put(now, new HashMap<>());
        }

        void addAll(String[] args) {
            for (String str : args) {
                add(str);
            }
            next();
        }

        void add(String str) {
            inputs.get(now).put(innerNext++, str);
        }

        void next() {
            inputs.put(++now, new HashMap<>());
            innerNext = 1;
        }

        String getString(int i, int j) {
            return inputs.get(i).get(j);
        }

        int getInt(int i, int j) {
            return Integer.parseInt(getString(i, j));
        }

        double getDouble(int i, int j) {
            return Double.parseDouble(getString(i, j));
        }

        List<Integer> getIntLine(int i) {
            return inputs.get(i).entrySet().stream().map(e -> Integer.parseInt(e.getValue()))
                    .collect(Collectors.toList());
        }

        List<Integer> getIntVerticalLine(int line, int start, int size) {
            List<Integer> list = new ArrayList<>();
            for(int i = start; i < start + size; i++) {
                list.add(getInt(i, line));
            }
            return list;
        }
    }
}