func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = 0x7FFFFFFF;   template <class T>   T gcd(T a, T b) {     return b == 0 ? a : gcd(b, a % b);   }   template <typename T>   T lcm(T a, T b) {     return a / gcd(a, b) * b;   }   template <class T>   T big_mod(T n, T p, T m) {     if (p == 0) return (T)1;     T x = big_mod(n, p / 2, m);     x = (x * x) % m;     if (p & 1) x = (x * n) % m;     return x;   }   template <class T>   T my_pow(T n, T p) {     if (p == 0) return 1;     T x = my_pow(n, p / 2);     x = (x * x);     if (p & 1) x = (x * n);     return x;   }   template <class T>   inline T Mod(T n, T m) {     return (n % m + m) % m;   }   template <class T>   T MIN(T a, T b, T c) {     return min(a, min(b, c));   }   template <class T>   T MAX(T a, T b, T c) {     return max(a, max(b, c));   }   int n, m, segment[10000];   int main() {     cin >> n >> m;     for (int i = 1; i <= m; i++) {       int x, y;       cin >> x >> y;       for (int j = x; j <= y; j++) {         segment[j]++;       }     }     for (int i = 1; i <= n; i++) {       if (segment[i] != 1) {         printf( %d %d n , i, segment[i]);         return 0;       }     }     printf( OK n );     return 0;   }   