#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll MOD = 1000000007;
const long long INF = 1LL << 60;
#define rep(i,n) for(int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()

int main() {
    int n, q, ans;
    cin >> n >> q;
    vector<int> a;
    rep(i,q){
        int l, r;
        cin >>  l >> r;
        a.push_back(l);
        a.push_back(r+1);
        sort(all(a));
        for(int j = 0; j < 2*(i+1); j += 2) ans = a[j+1]-a[j];
        cout << ans << endl;
    }
}