Kyselyt

input/code.cpp: In function 'int main()':
input/code.cpp:202:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     std::scanf("%d", &q);
                         ^
input/code.cpp:211:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             std::scanf("%zd", &tmp.k);
                                      ^

#include <algorithm>
#include <cassert>
/* #include <iostream> */
#include <array>
#include <cstdio>
#include <set>
#include <string>
#include <vector>

std::size_t count_digits(std::size_t x)
{
    // clang-format off
    return (x < 10u ? 1 :   
        (x < 100u ? 2 :   
        (x < 1000u ? 3 :   
        (x < 10000u ? 4 :   
        (x < 100000u ? 5 :   
        (x < 1000000u ? 6 :   
        (x < 10000000u ? 7 :  
        (x < 100000000u ? 8 :  
        (x < 1000000000u ? 9 :
        (x < 10000000000u ? 10 :
        (x < 100000000000u ? 11 :
        (x < 1000000000000u ? 12 :
        (x < 10000000000000u ? 13 :
        (x < 100000000000000u ? 14 :
        (x < 1000000000000000u ? 15 :
        (x < 10000000000000000u ? 16 :
        (x < 100000000000000000u ? 17 :
        (x < 1000000000000000000u ? 18 :
        (x < 10000000000000000000u ? 19 :
        20)))))))))))))))))));
    // clang-format on
}

std::size_t pow10(std::size_t pow)
{
    static std::array<std::size_t, 20> p = {{1u,
                                             10u,
                                             100u,
                                             1000u,
                                             10000u,
                                             100000u,
                                             1000000u,
                                             10000000u,
                                             100000000u,
                                             1000000000u,
                                             10000000000u,
                                             100000000000u,
                                             1000000000000u,
                                             10000000000000u,
                                             100000000000000u,
                                             1000000000000000u,
                                             10000000000000000u,
                                             100000000000000000u,
                                             1000000000000000000u,
                                             10000000000000000000u}};
    return p[pow];
}

char get_digit(std::size_t number, std::size_t digit)
{
    digit = count_digits(number) - digit - 1;
    return (number / pow10(digit)) % 10 + '0';
}

std::size_t get_matching_pow10(std::size_t number)
{
    std::size_t i = 1;
    while ((i * 10) > number) {
        i *= 10;
    }
    return i;
}

std::size_t get_next_pow10(std::size_t number)
{
    std::size_t i = 1;
    while ((i * 10) < number) {
        i *= 10;
    }
    return i;
}

struct series_point {
    std::size_t member{1};
    std::size_t number{1};

    constexpr series_point() = default;

    series_point& get_point(std::size_t m)
    {
        while (true) {
            if (member >= m) {
                return *this;
            }
            if (m - member >= 25) {
                const auto digits = count_digits(number);
                const auto next_pow10 = get_next_pow10(number);
                if (next_pow10 > number) {
                    const auto dist_till_pow10 = next_pow10 - number;
                    if (dist_till_pow10 > 1) {
                        member += dist_till_pow10 * digits;
                        number += dist_till_pow10;
                        continue;
                    }
                }
            }
            member += count_digits(number++);
        }
    }

    series_point& get_prev()
    {
        member -= count_digits(--number);
        return *this;
    }

    series_point& get_preceding(std::size_t m)
    {
        while(true) {
            if(member <= m) {
                return *this;
            }
            if(member - m >= 25) {}
        }
    }

    char get_char(std::size_t m)
    {
        get_point(m);
        if (member > m) {
            get_prev();
        }
        return get_digit(number, m - member);
    }

    series_point copy() const
    {
        return *this;
    }

    /*     friend std::ostream& operator<<(std::ostream& os, const series_point&
     * p) */
    /*     { */
    /*         os << "member: " << p.member << ", number: " << p.number; */
    /*         return os; */
    /*     } */
};

struct input {
    std::size_t i{0};
    std::size_t k{0};

    bool operator<(const input& i) const
    {
        return k < i.k;
    }

    /*     friend std::ostream& operator<<(std::ostream& os, const input& i) */
    /*     { */
    /*         os << "i: " << i.i << ", k: " << i.k << ", result: " << i.result;
     */
    /*         return os; */
    /*     } */
};

int main()
{
    /* series_point s; */
    /* assert(pow10(1) == 10); */
    /* assert(pow10(2) == 100); */
    /* std::cout << get_digit(13, 0) << ' ' << get_digit(13, 1) << '\n'; */
    /* assert(get_digit(1, 0) == '1'); */
    /* assert(get_digit(13, 1) == '3'); */
    /* assert(series_point{}.get_char(1) == '1'); */
    /* assert(series_point{}.get_char(10) == '1'); */
    /* assert(series_point{}.get_char(11) == '0'); */
    /* for (std::size_t i = 1; i <= 1010; ++i) { */
    /*     auto a = s.get_char(i); */
    /*     auto c = series_point{}.get_char(i); */
    /*     if (i % 29 == 0) { */
    /*         auto tmp = series_point{}; */
    /*         auto b = tmp.get_char(i); */
    /*         if (a != b) { */
    /*             std::cout << " * At i = " << i << ", a != b:\n" */
    /*                       << "   a = " << a << ", b = " << b << '\n' */
    /*                       << "   State of s (a):   " << s << '\n' */
    /*                       << "   State of tmp (b): " << tmp << '\n'; */
    /*         } */
    /*         if(b != c) { */
    /*             std::cout << " * At i = " << i << ", b != c:\n" */
    /*                       << "   b = " << b << ", c = " << c << '\n' */
    /*                       << "   State of tmp (b):   " << tmp << '\n'; */
    /*         } */
    /*     } */
    /* } */

    series_point s;
    int q;
    /* std::cin >> q; */
    std::scanf("%d", &q);

    /* std::vector<input> inputs(q); */
    std::multiset<input> inputs{};
    {
        /* std::size_t ix = 0; */
        /* for (auto& i : inputs) { */
        for (auto ix = 0; ix < q; ++ix) {
            input tmp{};
            std::scanf("%zd", &tmp.k);
            /* std::cin >> i.k; */
            tmp.i = ix;
            inputs.insert(std::move(tmp));
        }
    }

    std::vector<std::size_t> outputs(q);
    for (auto& i : inputs) {
        outputs[i.i] = s.get_char(i.k);
    }

    for (auto& i : outputs) {
        /* std::cout << i.result << '\n'; */
        std::putchar(i);
        std::putchar('\n');
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: TIME LIMIT EXCEEDED