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- // Hack it and have it ;) //
- /*author* Priyanshu Shrivastav (from IIT Palakkad) *
- * *_ __ ___ _ ______ ___ _ ____ ___ ___| |_ *
- * | '_ ` _ \| '__/ __/ _ \| '_ \ \ / / |/ __| __| *
- * | | | | | | | | (_| (_) | | | \ V /| | (__| |_ *
- * |_| |_| |_|_|(_)___\___/|_| |_|\_/ |_|\___|\__| *
- When I wrote this, only God and I understood what I was doing
- ** * * * * * * * Now, only God knows!* * * * * * */
- #include <bits/stdc++.h> /*{{{*/
- #include <ext/pb_ds/assoc_container.hpp>
- #include <ext/pb_ds/tree_policy.hpp>
- using namespace std;
- using namespace __gnu_pbds;
- #ifndef CONVICTION
- #pragma GCC optimize ("Ofast")
- #pragma GCC optimize ("unroll-loops")
- #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
- #endif
- #define IOS ios_base::sync_with_stdio(false); cin.tie (nullptr)
- #define PREC cout.precision (10); cout << fixed
- #define X first
- #define Y second
- #define sz(x) (int)x.size()
- #define fr(i,x,y) for (int i = (int)x; i <= (int)y; ++i)
- #define rv(i,x,y) for (int i = (int)x; i >= (int)y; --i)
- #define bcnt(x) __builtin_popcount(x)
- #define bcntll(x) __builtin_popcountll(x)
- #define bg(x) " [ " << #x << " : " << (x) << " ] "
- #define un(x) sort(x.begin(), x.end()), \
- x.erase(unique(x.begin(), x.end()), x.end())
- using ll = long long;
- using ull = unsigned long long;
- using ff = long double;
- using pii = pair<int,int>;
- using pil = pair<int,ll>;
- using pll = pair<ll,ll>;
- using vi = vector <int>;
- using vl = vector<ll>;
- using vvi = vector <vi>;
- using vvl = vector <vl>;
- using vp = vector <pii>;
- using vvp = vector <vp>;
- typedef tree
- < int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
- ordered_set;
- struct chash {
- int operator () (pii x) const { return x.X*31 + x.Y; }
- };
- gp_hash_table <pii, int, chash> gmp;
- #if __cplusplus > 201103L
- seed_seq seq{
- (uint64_t) chrono::duration_cast<chrono::nanoseconds>
- (chrono::high_resolution_clock::now().time_since_epoch()).count(),
- (uint64_t) __builtin_ia32_rdtsc(),
- (uint64_t) (uintptr_t) make_unique<char>().get()
- };
- mt19937 rng(seq); //uniform_int_distribution<int> (l, h)(rng); //[low, high]
- #else
- auto seed = chrono::high_resolution_clock::now().time_since_epoch().count();
- mt19937 rng(seed);
- #endif
- #ifdef CONVICTION
- void __print(int x) {cerr << x;}
- void __print(long x) {cerr << x;}
- void __print(long long x) {cerr << x;}
- void __print(unsigned x) {cerr << x;}
- void __print(unsigned long x) {cerr << x;}
- void __print(unsigned long long x) {cerr << x;}
- void __print(float x) {cerr << x;}
- void __print(double x) {cerr << x;}
- void __print(long double x) {cerr << x;}
- void __print(char x) {cerr << '\'' << x << '\'';}
- void __print(const char *x) {cerr << '\"' << x << '\"';}
- void __print(const string &x) {cerr << '\"' << x << '\"';}
- void __print(bool x) {cerr << (x ? "true" : "false");}
- template<typename T, typename V>
- void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
- template<typename T>
- void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
- void _print() {cerr << "]" << endl;}
- template <typename T, typename... V>
- void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
- #define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
- #else
- #define debug(x...)
- #endif
- // __ __
- // (**) (**)
- // IIII IIII
- // #### ####
- // HHHH Madness comes, and madness goes HHHH
- // HHHH An insane place, with insane moves HHHH
- // #### Battles without, for battles within ####
- // ___IIII___ Where evil lives, ___IIII___
- // .-`_._"**"_._`-. and evil rules .-`_._"**"_._`-.
- // |/`` .`\/`. ``\| Breaking them up, |/`` .`\/`. ``\|
- // ` } { ' just breaking them in ` } { '
- // ) () ( Quickest way out, quickest way wins ) () (
- // ( :: ) Never disclose, never betray ( :: )
- // | :: | Cease to speak or cease to breath | :: |
- // | )( | And when you kill a man, | )( |
- // | || | you're a murderer | || |
- // | || | Kill many | || |
- // | || | and you're a conqueror | || |
- // | || | Kill them all ... Ooh.. | || |
- // | || | Oh you're a God! | || |
- // ( () ) -Megadeth ( () )
- // \ / \ /
- // \/ \/
- /*}}}*/
- /*****************************************************************************/
- //Don’t practice until you get it right. Practice until you can’t get it wrong
- void solve() {
- int n, m;
- cin >> n >> m;
- vector <int> ar(n);
- for (int i = 0; i < n; ++i)
- cin >> ar[i];
- vector <int> F, S;
- int __n = n/2;
- for (int mask = 0; mask < (1 << __n); ++mask) {
- int res = 0;
- for (int i = 0; i < __n; ++i)
- if (mask & (1 << i)) res += ar[i], res %= m;
- F.push_back(res);
- }
- for (int mask = 0; mask < (1 << (n - __n)); ++mask) {
- int res = 0;
- for (int i = __n; i < n; ++i)
- if (mask & (1 << (i - __n))) res += ar[i], res %= m;
- S.push_back(res);
- }
- un(F), un(S);
- int ssz = (int)S.size();
- int mx = 0;
- for (int f : F) {
- int rem = m - f - 1;
- int idx = int(lower_bound(S.begin(), S.end(), rem) - S.begin());
- if (idx < ssz) {
- if (S[idx] > rem) --idx;
- if (idx < ssz && idx >= 0) mx = max(mx, (f + S[idx]) % m);
- }
- else
- mx = max(mx, (f + S.back()) % m);
- }
- cout << mx << '\n';
- }
- signed main() {
- IOS; PREC;
- int tc = 1;
- // cin >> tc;
- for (int Tt = 1; Tt <= tc; ++Tt) {
- // cout << "Case #" << Tt << ": ";
- solve();
- }
- return EXIT_SUCCESS;
- }
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