Submission #1094961

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094961		cpptowin	Bootfall (IZhO17_bootfall)	C++17	0 / 100	1008 ms	856 KiB

bootfall

#include <bits/stdc++.h>
#define fo(i, d, c) for (int i = d; i <= c; i++)
#define fod(i, c, d) for (int i = c; i >= d; i--)
#define maxn 1000010
#define N 1010
#define fi first
#define se second
#define pb emplace_back
#define en cout << "\n";
#define bitcount(x) __builtin_popcountll(x)
#define pii pair<int, int>
#define vii vector<pii>
#define lb(x) x & -x
#define bit(i, j) ((i >> j) & 1)
#define offbit(i, j) (i ^ (1LL << j))
#define onbit(i, j) (i | (1LL << j))
#define vi vector<int>
#define all(x) x.begin(), x.end()
#define ss(x) (int)x.size()
template <typename T1, typename T2>
bool minimize(T1 &a, T2 b)
{
    if (a > b)
    {
        a = b;
        return true;
    }
    return false;
}
template <typename T1, typename T2>
bool maximize(T1 &a, T2 b)
{
    if (a < b)
    {
        a = b;
        return true;
    }
    return false;
}
using namespace std;
static struct FastInput
{
    static constexpr int BUF_SIZE = 1 << 20;
    char buf[BUF_SIZE];
    size_t chars_read = 0;
    size_t buf_pos = 0;
    FILE *in = stdin;
    char cur = 0;

    inline char get_char()
    {
        if (buf_pos >= chars_read)
        {
            chars_read = fread(buf, 1, BUF_SIZE, in);
            buf_pos = 0;
            buf[0] = (chars_read == 0 ? -1 : buf[0]);
        }
        return cur = buf[buf_pos++];
    }

    inline void tie(int) {}

    inline explicit operator bool()
    {
        return cur != -1;
    }

    inline static bool is_blank(char c)
    {
        return c <= ' ';
    }

    inline bool skip_blanks()
    {
        while (is_blank(cur) && cur != -1)
        {
            get_char();
        }
        return cur != -1;
    }

    inline FastInput &operator>>(char &c)
    {
        skip_blanks();
        c = cur;
        return *this;
    }

    inline FastInput &operator>>(string &s)
    {
        if (skip_blanks())
        {
            s.clear();
            do
            {
                s += cur;
            } while (!is_blank(get_char()));
        }
        return *this;
    }

    template <typename T>
    inline FastInput &read_integer(T &n)
    {
        // unsafe, doesn't check that characters are actually digits
        n = 0;
        if (skip_blanks())
        {
            int sign = +1;
            if (cur == '-')
            {
                sign = -1;
                get_char();
            }
            do
            {
                n += n + (n << 3) + cur - '0';
            } while (!is_blank(get_char()));
            n *= sign;
        }
        return *this;
    }

    template <typename T>
    inline typename enable_if<is_integral<T>::value, FastInput &>::type operator>>(T &n)
    {
        return read_integer(n);
    }

#if !defined(_WIN32) || defined(_WIN64)
    inline FastInput &operator>>(__int128 &n)
    {
        return read_integer(n);
    }
#endif

    template <typename T>
    inline typename enable_if<is_floating_point<T>::value, FastInput &>::type operator>>(T &n)
    {
        // not sure if really fast, for compatibility only
        n = 0;
        if (skip_blanks())
        {
            string s;
            (*this) >> s;
            sscanf(s.c_str(), "%lf", &n);
        }
        return *this;
    }
} fast_input;

#define cin fast_input

static struct FastOutput
{
    static constexpr int BUF_SIZE = 1 << 20;
    char buf[BUF_SIZE];
    size_t buf_pos = 0;
    static constexpr int TMP_SIZE = 1 << 20;
    char tmp[TMP_SIZE];
    FILE *out = stdout;

    inline void put_char(char c)
    {
        buf[buf_pos++] = c;
        if (buf_pos == BUF_SIZE)
        {
            fwrite(buf, 1, buf_pos, out);
            buf_pos = 0;
        }
    }

    ~FastOutput()
    {
        fwrite(buf, 1, buf_pos, out);
    }

    inline FastOutput &operator<<(char c)
    {
        put_char(c);
        return *this;
    }

    inline FastOutput &operator<<(const char *s)
    {
        while (*s)
        {
            put_char(*s++);
        }
        return *this;
    }

    inline FastOutput &operator<<(const string &s)
    {
        for (int i = 0; i < (int)s.size(); i++)
        {
            put_char(s[i]);
        }
        return *this;
    }

    template <typename T>
    inline char *integer_to_string(T n)
    {
        // beware of TMP_SIZE
        char *p = tmp + TMP_SIZE - 1;
        if (n == 0)
        {
            *--p = '0';
        }
        else
        {
            bool is_negative = false;
            if (n < 0)
            {
                is_negative = true;
                n = -n;
            }
            while (n > 0)
            {
                *--p = (char)('0' + n % 10);
                n /= 10;
            }
            if (is_negative)
            {
                *--p = '-';
            }
        }
        return p;
    }

    template <typename T>
    inline typename enable_if<is_integral<T>::value, char *>::type stringify(T n)
    {
        return integer_to_string(n);
    }

#if !defined(_WIN32) || defined(_WIN64)
    inline char *stringify(__int128 n)
    {
        return integer_to_string(n);
    }
#endif

    template <typename T>
    inline typename enable_if<is_floating_point<T>::value, char *>::type stringify(T n)
    {
        sprintf(tmp, "%.17f", n);
        return tmp;
    }

    template <typename T>
    inline FastOutput &operator<<(const T &n)
    {
        auto p = stringify(n);
        for (; *p != 0; p++)
        {
            put_char(*p);
        }
        return *this;
    }
} fast_output;

#define cout fast_output
const int nsqrt = 450;
const int mod = 1e9 + 7;
void add(int &x, int k)
{
    x += k;
    x %= mod;
    if(x < 0) x += mod;
}
void del(int &x, int k)
{
    x -= k;
    x %= mod;
    if(x < 0) x += mod;
}
const int nn = 250001;
int n,a[maxn];
bitset<nn> f,ans[502];
main()
{
#define name "TASK"
    if (fopen(name ".inp", "r"))
    {
        freopen(name ".inp", "r", stdin);
        freopen(name ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    fo(i,1,n) cin >> a[i];
    int tot = 0;
    f[0] = 1;
    fo(i,1,n)
    {
        f |= f << a[i];
        tot += a[i];
    }
    if(tot % 2 == 1 or f[tot / 2] == 0) return cout << 0,0;
    fo(j,1,tot) ans[n + 1][j] = 1;
    fo(i,1,n)
    {
        fo(j,1,tot) 
        {
            f = 0;
            f[0] = 1;
            a[n + 1] = j;
            fo(k,1,n + 1) if(k != i)
            {
                f |= f << a[k];
            }
            int tot1 = tot - a[i] + a[n + 1];
            if(tot1 % 2 == 0 and f[tot1 / 2] == 1) ans[i][j] = 1;
        }
        ans[n + 1] &= ans[i];
    }
    cout << ans[n + 1].count();en;
    fo(j,1,tot) if(ans[n + 1][j]) cout << j << ' ';
}

Compilation message (stderr)

bootfall.cpp:282:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  282 | main()
      | ^~~~
bootfall.cpp: In function 'int main()':
bootfall.cpp:291:13: warning: passing NULL to non-pointer argument 1 of 'void FastInput::tie(int)' [-Wconversion-null]
  291 |     cin.tie(NULL);
      |             ^~~~
bootfall.cpp:61:21: note:   declared here
   61 |     inline void tie(int) {}
      |                     ^~~
bootfall.cpp:287:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  287 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bootfall.cpp:288:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  288 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 21
• Subtask 6: 0 / 35