제출 #1335559

#제출 시각아이디문제언어결과실행 시간메모리
1335559vahagng수열 (APIO14_sequence)C++20
0 / 100
1 ms344 KiB
//----------vahagng----------//
#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
using namespace std;
// using namespace __gnu_pbds;

// template <class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif

void print(long long t) { cerr << t; }
void print(int t) { cerr << t; }
void print(string t) { cerr << t; }
void print(char t) { cerr << t; }
void print(double t) { cerr << t; }
void print(long double t) { cerr << t; }
void print(unsigned long long t) { cerr << t; }

template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[], V n) { cerr << "["; for (int i = 0; i < n; i++) { cerr << v[i] << " "; } cerr << "]"; }
template <class T, class V> void print(pair <T, V> p) { cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}"; }
template <class T> void print(vector <T> v) { cerr << "[ "; for (T i : v) { print(i); cerr << " "; } cerr << "]"; }
template <class T> void print(set <T> v) { cerr << "[ "; for (T i : v) { print(i); cerr << " "; } cerr << "]"; }
template <class T> void print(unordered_set <T> v) { cerr << "[ "; for (T i : v) { print(i); cerr << " "; } cerr << "]"; }
template <class T> void print(multiset <T> v) { cerr << "[ "; for (T i : v) { print(i); cerr << " "; } cerr << "]"; }
template <class T, class V> void print(map <T, V> v) { cerr << "[ "; for (auto i : v) { print(i); cerr << " "; } cerr << "]"; }

#define ll long long
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define ld long double
#define sz(v) v.size()
#define endl '\n'

const ll inf = 2e18, mod = 1e9 + 7, mod2 = 998244353, mod3 = 1e9 + 9;

void SetIO(string str = "") {
    if (str != "") {
        freopen((str + ".in").c_str(), "r", stdin);
        freopen((str + ".out").c_str(), "w", stdout);
    }
    else {
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    }
}

void FastIO() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
}

const int N = 3e5 + 10, M = 2e7 + 10;

mt19937 rnd(chrono::system_clock::now().time_since_epoch().count());

ll binpow(ll a, ll b, ll m) {
    ll res = 1;
    while (b) {
        if (b & 1) {
            res = (res * a) % m;
        }
        b >>= 1;
        a = (a * a) % m;
    }
    return res;
}

__int128_t gcd(__int128_t a, __int128_t b) {
    while (b) {
        a %= b;
        swap(a, b);
    }
    return a;
}

__int128_t lcm(__int128_t a, __int128_t b) {
    return a / gcd(a, b) * b;
}

ll n, k, a[N], p[N], dp1[100001], dp2[100001], par[100001][201], pre[1001][202];

ll C(int l, int r){
    return (p[r] - p[l - 1]) * (p[n] - p[r]);
}

void rec(int l, int r, int lx, int rx, int K) {
    if (l > r) return;
    int m = (l + r) / 2;
    pair<ll, ll> mx = { -inf, -1 };
    for (int i = lx; i <= min(m, rx); i++) {
        mx = max(mx, { dp2[i - 1] + C(i, m), i });
    }
    dp1[m] = mx.first;
    par[m][K] = mx.second - 1;
    rec(l, m - 1, lx, mx.second, K);
    rec(m + 1, r, mx.second, rx, K);
}

void solve(int tc) {
    cin >> n >> k;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        p[i] = p[i - 1] + a[i];
    }
    // for (int K = 2; K <= k; K++) {
    //     for (int i = K; i <= n; i++) {
    //         for (int j = i; j >= K - 1; j--) {
    //             if (dp1[i] < dp1[j - 1][K - 1] + (p[n] - p[i]) * (p[i] - p[j - 1])) {
    //                 dp[i][K] = dp[j - 1][K - 1] + (p[n] - p[i]) * (p[i] - p[j - 1]);
    //                 par[i][K] = j - 1;
    //             }
    //         }
    //     }
    // }
    for (int j = 0; j < k; j++) {
        rec(1, n, 1, n, j + 1);
        for (int i = 1; i <= n; i++) dp2[i] = dp1[i];
    }
    ll ans = -inf, id = -1;
    for(int i = 1; i <= n; i++){
        if(ans < dp1[i]){
            ans = dp1[i];
            id = i;
        }
    }
    cout << ans << endl;
    int cur = id, j = k;
    if (k == 1) {
        cout << cur << endl;
        return;
    }
    vector<int>v;
    while (cur) {
        v.push_back(cur);
        cur = par[cur][j];
        j--;
    }
    reverse(all(v));
    for(auto i : v) cout << i << ' ';
    cout << endl;
}


void precalc() {
    
}

int main() {
    // SetIO("teamwork");
    FastIO();
    int test_case = 1;
    // cin >> test_case;
    precalc();
    int cnt = 1;
    while (test_case--) {
        solve(cnt++);
    }
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

sequence.cpp: In function 'void SetIO(std::string)':
sequence.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen((str + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:49:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         freopen((str + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:52:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:53:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
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