func_code_string: #include <bits/stdc++.h>   using namespace std;   char rd;   int sig;   template <class T>   inline void read(T &a) {     for (a = 0, rd = getchar(); ( 0  > rd || rd >  9 ) && rd !=  - ;          rd = getchar())       ;     for (rd ==  -  ? sig = -1, rd = getchar() : sig = 1;  0  <= rd && rd <=  9 ;)       a *= 10, a += rd -  0 , rd = getchar();     a *= sig;   }   int n, k, l[100005], r[100005];   int main() {     read(n);     read(k);     int tot = 0;     for (int i = (1); i <= (n); ++i)       read(l[i]), read(r[i]), tot += r[i] - l[i] + 1;     int ans = (k - tot % k) % k;     printf( %d n , ans);     return 0;   }   