func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1e5 + 5;   int n, m, mex = N, ans[N];   pair<int, int> a[N];   int main() {     cin >> n >> m;     for (int i = 1; i <= m; ++i) {       int l, r;       cin >> l >> r;       a[i] = {l, r};       mex = min(mex, r - l + 1);     }     int cur = 0;     cout << mex <<   n ;     for (int i = 1; i <= n; ++i) {       if (cur == mex) cur = 0;       cout << cur++ <<    ;     }   }   