QOJ.ac

QOJ

ID题目提交者结果用时内存语言文件大小提交时间测评时间
#644672#7904. Rainbow Subarrayjty233TL 642ms13524kbC++236.8kb2024-10-16 15:01:372024-10-16 15:01:41

Judging History

你现在查看的是最新测评结果

  • [2024-10-16 15:01:41]
  • 评测
  • 测评结果：TL
  • 用时：642ms
  • 内存：13524kb
查看
  • [2024-10-16 15:01:37]
  • 提交

answer

#include "bits/stdc++.h"
using namespace std;

#ifndef ALGORITHM_OPT_SEARCH
#define ALGORITHM_OPT_SEARCH
// 优化查找通用算法

// depends random.hpp

namespace Search
{
    const double PI = acosl(-1.);
    constexpr double INF = 1e20;
    constexpr double EPS = 1e-12;
    namespace Binary
    {
        template <typename T>
        T solve_max(T L, T R, const std::function<bool(T)> &check)
        {
            T l = L, r = R;
            bool spj = std::is_integral<T>::value;
            while (l + EPS < r)
            {
                T mid = (l + r) / 2;
                if (check(mid))
                    l = mid + spj;
                else
                    r = mid;
            }
            return (l + r) / 2;
        }
        template <typename T>
        T solve_min(T L, T R, const std::function<bool(T)> &check)
        {
            return solve_max(L, R, [&check](T x) -> bool
                             { return !check(x); }) +
                   std::is_integral<T>::value;
        }
    }
    namespace Ternary
    {
        template <typename T, typename Calc>
        T solve_max(T L, T R, const Calc&calc)
        {
            T l = L, r = R;
            while (l < r)
            {
                T midl = l + (r - l) / 3;
                T midr = r - (r - l) / 3;
                if (calc(midl) < calc(midr))
                    l = midl + 1;
                else
                    r = midr - 1;
            }
            return (l + r) / 2;
        }
        template <typename T, typename Calc>
        T solve_min(T L, T R, const Calc&calc)
        {
            return solve_max<T>(L, R, [&calc](T x) -> double
                                { return -calc(x); });
        }
    }
}

#endif

#ifndef FENWICK_TREE
#define FENWICK_TREE
// 树状数组

int lowbit(int x) { return x & -x; }

template <typename T = int>
struct BIT
{
    int n;
    std::vector<T> node;
    BIT(int n = 0) { init(n); }
    BIT(const std::vector<T> &initarr)
    {
        init(initarr);
    }
    void init(const std::vector<T> &initarr)
    {
        init(initarr.size());
        for (int i = 1; i <= n; i++)
        {
            node[i] += initarr[i - 1];
            if (i + lowbit(i) <= n)
                node[i + lowbit(i)] += node[i];
        }
    }
    void init(int n)
    {
        this->n = n;
        node.assign(n + 1, T());
    }
    void add(int k, T v)
    {
        if (!k)
            return;
        for (; k <= n; k += lowbit(k))
            node[k] += v;
    }
    T ask(int k)
    {
        T ret = 0;
        for (; k > 0; k -= lowbit(k))
            ret += node[k];
        return ret;
    }
    T ask(int l, int r)
    {
        if (l > r)
            std::swap(l, r);
        return ask(r) - ask(l - 1);
    }
    int kth(T k)
    {
        int x = 0;
        for (int i = 1 << std::__lg(n); i; i >>= 2)
        {
            if (x + i <= n && k >= node[x + i - 1])
            {
                x += i;
                k -= node[x - 1];
            }
        }
        return x;
    }
};

template <typename T = int>
struct BIT_range
{
    int n;
    BIT<T> di, dn;
    BIT_range(int n = 0) : di(n), dn(n) {}
    BIT_range(const std::vector<T> &initarr)
    {
        init(initarr);
    }
    void init(const std::vector<T> &initarr)
    {
        init(initarr.size());
        for (int i = 1; i <= n; i++)
        {
            di.node[i] += i * initarr[i - 1];
            if (i < n)
                di.node[i + 1] -= (i + 1) * initarr[i - 1];
            if (i + lowbit(i) <= n)
                di.node[i + lowbit(i)] += di.node[i];
            dn.node[i] += initarr[i - 1];
            if (i < n)
                dn.node[i + 1] -= initarr[i - 1];
            if (i + lowbit(i) <= n)
                dn.node[i + lowbit(i)] += dn.node[i];
        }
    }
    void init(int n)
    {
        this->n = n;
        di.init(n + 1);
        dn.init(n + 1);
    }
    void __add(int k, int v)
    {
        di.add(k, k * v);
        dn.add(k, v);
    }
    void add(int l, int r, T v)
    {
        if (l > r)
            std::swap(l, r);
        __add(l, v);
        __add(r + 1, -v);
    }
    void add(int k, T v) { add(k, k, v); }
    T __ask(int k)
    {
        return (k + 1) * dn.__ask(k) - di.__ask(k);
    }
    T ask(int l, int r)
    {
        if (l > r)
            std::swap(l, r);
        return __ask(r) - __ask(l - 1);
    }
};

#endif

using i64 = long long;

constexpr i64 M = 1e9 + 7;

i64 qpow(i64 x, i64 y)
{
    i64 res = 1ll;
    while (y)
    {
        if (y & 1)
            res = res * x % M;
        x = x * x % M;
        y >>= 1;
    }
    return res;
}
i64 n, k;
int a[500005];
signed main()
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int T;
    cin >> T;
    while (T--)
    {
        cin >> n >> k;
        map<int, int> idx1;
        unordered_map<int, int> idx;
        vector<int> val(1);
        int cnt = 0;
        for (int i = 0; i < n; i++)
        {
            cin >> a[i];
            a[i] -= i;
            if (!idx1.count(a[i]))
                idx1[a[i]] = 1;
        }
        for (auto &[k, v] : idx1)
        {
            v = ++cnt;
            idx[k] = v;
            val.push_back(k);
        }
        BIT<i64> x1(cnt + 5);
        BIT x2(cnt + 5);
        int l = 0, r = 0;
        int ans = 0;

        x1.add(idx[a[0]], a[0]);
        x2.add(idx[a[0]], 1);

        while (l <= n)
        {
        start:
            // int li = idx[a[l]];
            // int ri = idx[a[r]];

            auto f = [&](int x) -> i64
            {
                i64 x_val = val[x];
                int lnum = x2.ask(x - 1);
                int rnum = x2.ask(x + 1, cnt);

                i64 lsum = x1.ask(x - 1);
                i64 rsum = x1.ask(x + 1, cnt);
                // cout << lnum << ' ' << lsum << ' ' << rnum << ' ' << rsum << " xval:" << x_val << endl;

                return lnum * x_val - lsum + rsum - rnum * x_val;
            };

            i64 use = Search::Ternary::solve_min<int>(1, cnt, f);
            use = f(use);
            if (use <= k && r < n)
            {
                // cout << l << " " << r << " => " << use << endl;
                ans = max(ans, r - l + 1);
                r++;
                x1.add(idx[a[r]], a[r]);
                x2.add(idx[a[r]], 1);
                goto start;
            }

            x1.add(idx[a[l]], -a[l]);
            x2.add(idx[a[l]], -1);
            l++;

            if (r == n)
                continue;
            r++;
            x1.add(idx[a[r]], a[r]);
            x2.add(idx[a[r]], 1);
        }
        cout << ans << '\n';
    }

    return 0;
}
源文件, 语言: C++23

詳細信息

Test #1:

score: 100
Accepted
time: 0ms
memory: 3556kb

input:

5
7 5
7 2 5 5 4 11 7
6 0
100 3 4 5 99 100
5 6
1 1 1 1 1
5 50
100 200 300 400 500
1 100
3

output:

4
3
5
1
1

result:

ok 5 lines

Test #2:

score: 0
Accepted
time: 642ms
memory: 13524kb

input:

11102
2 167959139
336470888 134074578
5 642802746
273386884 79721198 396628655 3722503 471207868
6 202647942
268792718 46761498 443917727 16843338 125908043 191952768
2 717268783
150414369 193319712
6 519096230
356168102 262263554 174936674 407246545 274667941 279198849
9 527268921
421436316 3613460...

output:

1
4
3
2
6
5
7
2
4
1
4
1
1
3
2
2
7
8
7
7
1
7
6
2
4
3
1
6
7
7
3
4
3
9
3
8
6
6
3
1
6
3
1
2
4
6
4
6
4
1
4
7
1
6
3
5
6
6
1
7
5
3
1
6
4
5
3
2
2
6
2
3
10
1
4
3
2
4
5
1
7
5
5
5
8
5
3
6
3
5
5
8
5
4
5
2
1
5
2
3
3
4
8
1
3
1
2
2
8
3
1
6
8
1
8
4
5
6
6
8
4
8
3
2
8
4
5
6
2
6
2
4
1
5
4
5
3
2
4
1
2
1
4
5
8
3
7
3
3
3...

result:

ok 11102 lines

Test #3:

score: -100
Time Limit Exceeded

input:

1
500000 17244641009859
54748096 75475634 204928248 276927808 84875072 103158867 27937890 322595515 186026685 45468307 69240390 139887597 188586447 373764525 121365644 310156469 185188306 60350786 211308832 384695957 370562147 208427221 35937909 267590963 126478310 275357775 55361535 335993561 36696...

output:

result:
English 繁體中文 简体中文

伺服器時間: 2024-12-11 23:21:09 | 開源專案