繁华模拟赛 ljw分雕塑

/*
用f[i][k]表示考虑到第i个雕塑，分成k组，可不可行（这是一个bool类型的数组）
转移：
f[i][k]=f[j][k-1],sum[i]-sum[j]合法
*/
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
using namespace std;

typedef long long ll;
const int max_n = 2010;
const ll inf = 1e15;

inline int getnum() {
    int ans = 0; char c; bool flag = false;
    while (!isdigit(c = getchar()) && c != ‘-‘);
    if (c == ‘-‘) flag = true; else ans = c - ‘0‘;
    while (isdigit(c = getchar())) ans = ans * 10 + c - ‘0‘;
    return ans * (flag ? -1 : 1);
} 

int a[max_n], limit_A, limit_B, n;;

namespace part1 {
    const int max_n_small = 110;
    bool able[max_n_small][max_n_small];

    inline bool check(ll ba, ll tar) {
        memset(able, 0, sizeof(able));
        able[0][0] = true;

        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= limit_B; j++) {
                ll sum = a[i];
                for (int k = i - 1; k >= 0; k--) {
                    if (able[k][j - 1] && (sum | ba) < tar) {
                        able[i][j] = true;
                        break;
                    }
                    sum += a[k];
                }
            }

        for (int i = limit_A; i <= limit_B; i++)
            if (able[n][i])
                return true;
        return false;
    }

    inline void solve() {
        ll sum = 0;
        for (int i = 1; i <= n; i ++)
            sum += a[i];
        sum <<= 1;
        int max_bit = 0;
        for (; sum >> max_bit; max_bit++);
        max_bit--;

        ll ans = 0;
        for (int i = max_bit; i >= 0; i--) {
            ll tar = ans | (1LL << i);
            if (!check(ans, tar))
                ans += (1LL << i);
        }
        cout << ans << endl;
    }
}

namespace part2 {
    const int max_n_small = 2010;
    bool able[max_n_small];
    int f[max_n_small];

    inline bool check(ll ba, ll tar) {
        memset(able, 0, sizeof(able));
        memset(f, 0x7f, sizeof(f));
        able[0] = true;
        f[0] = 0;

        for (int i = 1; i <= n; i++) {
            ll sum = a[i];
            for (int k = i - 1; k >= 0; k--) {
                if (able[k] && (sum | ba) < tar) {
                    able[i] = true;
                    f[i] = min(f[i], f[k] + 1);
                }

                sum += a[k];
            }
        }

        if (able[n] && f[n] <= limit_B)
            return true;
        else
            return false;
    }

    inline void solve() {
        ll sum = 0;
        for (int i = 1; i <= n; i ++)
            sum += a[i];
        sum <<= 1;
        int max_bit = 0;
        for (; sum >> max_bit; max_bit++);
        max_bit--;

        ll ans = 0;
        for (int i = max_bit; i >= 0; i--) {
            ll tar = ans | (1LL << i);
            if (!check(ans, tar))
                ans += (1LL << i);
        }
        cout << ans << endl;
    }
}

int main() {
    freopen("sculpture.in", "r", stdin);
    freopen("sculpture.out", "w", stdout);
    n = getnum(); limit_A = getnum(); limit_B = getnum();
    for (int i = 1; i <= n; i++) a[i] = getnum();

    if (n > 100)
        part2::solve();
    else
        part1::solve();
}