Submission #1059924

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059924		vjudge1	Split the sequence (APIO14_sequence)	C++17	11 / 100	2081 ms	2540 KiB

sequence

/*
    Author:52ducbanh
    The best say which I think is:Never give up _ Let me see your attemption because you deserve to get it.
*/
#include<bits/stdc++.h>
using namespace std;
using namespace chrono;

mt19937 rd(steady_clock::now().time_since_epoch().count());

#define name "task"

#define ll long long
#define ld long double
#define pll pair<ll,ll>

#define fi first
#define se second
#define eb emplace_back
#define pb push_back
#define el '\n'
#define all(s) s.begin(),s.end()
#define bit(mask,i) ((mask >> i) & 1)
//For_constant//
const int MAX = 1e5 + 7;
const ll MOD = 1e9 + 7;
const ll MOD_power = 1e9 + 7;
const ll INF32 = 1e9 + 7;
const ll INF64 = 1e18;
const ll BASE = 333;
//For_initial_function//
template<typename T> T power(T a,T n) {
    T res = 1;
    while(n > 0)
    {
        if(n & 1)
        {
            res *= a;
            res %= MOD_power;
        }
        a *= a;
        a %= MOD_power;
        n >>= 1;
    }
    return res;
}
template<typename T> T gcd(T a,T b) {
    if(a == 0 || b == 0) return a + b;
    else return gcd(b,a % b);
}
template<typename T> T lcm(T a,T b) {
    return a/gcd(a,b) * b;
}
void initial(){
    srand(time(NULL));
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    if(fopen(name".INP","r"))
    {
        freopen(name".INP","r",stdin);
        freopen(name".OUT","w",stdout);
    }
    time_t now = time(0);
    cerr << ctime(&now);
}
//For_solving//

int n,k;
ll a[MAX];
ll pref[MAX];
ll ans = -1;
ll sum(int l,int r)
{
    return pref[r] - pref[l - 1];
}

vector<int> tt;
vector<int> store;

int choice[MAX];

ll check()
{
    ll ans1 = 0;
    int bef = 1;
    vector<int> be(n + 2,0);
    be[0] = 1;
    be[n + 1] = 1;
    for(auto it : tt)
    {
        int l = 0;
        int r = 0;
        for(int i = it;i >= 0;i--)
        {
            if(be[i] == 1)
            {
                l = i + 1;
                break;
            }
        }
        for(int i = it + 1;i <= n + 1;i++)
        {
            if(be[i] == 1)
            {
                r = i - 1;
                break;
            }
        }
        ans1 += sum(l,it) * sum(it + 1,r);
        be[it] = 1;
    }
    return ans1;
}

void Try(int j)
{
    for(int i = 1;i < n;i++)
    {
        if(choice[i] == 0)
        {
            choice[i] = 1;
            tt.eb(i);
            if(j == k)
            {
                ll val = check();
                if(ans < val)
                {
                    ans = val;
                    store = tt;
                }
            }
            else Try(j + 1);
            choice[i] = 0;
            tt.pop_back();
        }

    }
}

void solve()
{
    cin >> n >> k;
    for(int i = 1;i <= n;i++) cin >> a[i];
    for(int i = 1;i <= n;i++) pref[i] = pref[i - 1] + a[i];
    Try(1);
    cout << ans << el;
    for(auto it : store) cout << it << ' ';
}

void process_test()
{
    initial();
    int test;test = 1;
    while(test--) solve();
}

int main()
{
    //Started_time
    time_point<high_resolution_clock> st,ed;
    st = high_resolution_clock::now();
    //Solving
    process_test();
    //End_time
    ed = high_resolution_clock::now();
    auto start = time_point_cast<milliseconds>(st).time_since_epoch().count();
    auto end = time_point_cast<milliseconds>(ed).time_since_epoch().count();
    cerr <<"Time_wasting(milliseconds): " << end - start << el;
    return 0;
}

Compilation message (stderr)

sequence.cpp: In function 'long long int check()':
sequence.cpp:85:9: warning: unused variable 'bef' [-Wunused-variable]
   85 |     int bef = 1;
      |         ^~~
sequence.cpp: In function 'void initial()':
sequence.cpp:60:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         freopen(name".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen(name".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 11
• Subtask 3: 0 / 11
• Subtask 4: 0 / 17
• Subtask 5: 0 / 21
• Subtask 6: 0 / 29