func_code_string: #include <bits/stdc++.h>   using namespace std;   #pragma GCC optimize( O3 )   const long long MOD = 1e9 + 7;   long long n_bits(long long n) {     long long x = __builtin_popcount(n);     return x;   }   int pow(int a, int b, int m) {     int ans = 1;     while (b) {       if (b & 1) ans = (ans * a) % m;       b /= 2;       a = (a * a) % m;     }     return ans;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     long long t = 1;     while (t--) {       int n, p;       cin >> n >> p;       long long sum = 0;       int a[n];       long long left = 0;       for (int i = 0; i < n; i++) {         cin >> a[i];         sum += a[i];       }       long long final = (sum - a[n - 1]) % p + a[n - 1] % p;       sum -= a[n - 1];       left = a[n - 1];       for (int i = n - 2; i > 0; i--) {         left += a[i];         sum -= a[i];         final = max(final, left % p + sum % p);       }       cout << final;     }     return 0;   }   