Problem:
Score : 300 points

Problem Statement

We have N ID cards, and there are M gates.

We can pass the i-th gate if we have one of the following ID cards: the L_i-th, (L_i+1)-th, ..., and R_i-th ID cards.

How many of the ID cards allow us to pass all the gates alone?

Constraints

All values in input are integers.

1 \leq N \leq 10^5

1 \leq M \leq 10^5

1 \leq L_i \leq R_i \leq N

Input

Input is given from Standard Input in the following format:

N M
L_1 R_1
L_2 R_2
\vdots
L_M R_M

Output

Print the number of ID cards that allow us to pass all the gates alone.

Sample Input 1

4 2
1 3
2 4

Sample Output 1

2

Two ID cards allow us to pass all the gates alone, as follows:

The first ID card does not allow us to pass the second gate.

The second ID card allows us to pass all the gates.

The third ID card allows us to pass all the gates.

The fourth ID card does not allow us to pass the first gate.

Sample Input 2

10 3
3 6
5 7
6 9

Sample Output 2

1

Sample Input 3

100000 1
1 100000

Sample Output 3

100000

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using static System.Console;
using static System.Math;

class Program
{
    void Solve()
    {
        var N = io.Int;
        var M = io.Int;
        var L = new int[M];
        var R = new int[M];
        for (var i = 0; i < M; i++)
        {
            L[i] = io.Int;
            R[i] = io.Int;
        }

        var foo = new int[(int) 1e5 + 10];
        for (var i = 0; i < M; i++)
        {
            foo[L[i]]++;
            foo[R[i] + 1]--;
        }

        for (var i = 0; i < foo.Length - 1; i++)
        {
            foo[i + 1] += foo[i];
        }


        WriteLine(foo.Count(x => x == M));
    }


    SimpleIO io = new SimpleIO();
    public static void Main(string[] args) => new Program().Stream();

    private void Stream()
    {
        //var exStdIn = new System.IO.StreamReader("stdin.txt");
        //SetIn(exStdIn);
        Solve();
        io.Flush();
    }
}

class SimpleIO
{
    string[] _nextBuffer;
    int _bufferCnt;
    char[] cs = new char[] {' ', '"', ','};

    StreamWriter sw = new StreamWriter(OpenStandardOutput())
    {
#if DEBUG
        AutoFlush = true
#else
        AutoFlush = false
#endif
    };

    public SimpleIO()
    {
        _nextBuffer = new string[0];
        _bufferCnt = 0;
        SetOut(sw);
    }

    string Next()
    {
        if (_bufferCnt < _nextBuffer.Length) return _nextBuffer[_bufferCnt++];
        var st = ReadLine();
        while (st == string.Empty) st = ReadLine();
        _nextBuffer = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
        _bufferCnt = 0;
        return _nextBuffer[_bufferCnt++];
    }

    public string String => Next();
    public char Char => char.Parse(String);
    public int Int => int.Parse(String);
    public long Long => long.Parse(String);
    public double Double => double.Parse(String);
    public void Flush() => Out.Flush();
}