Submission #1159200

#	Time	Username	Problem	Language	Result	Execution time	Memory
1159200		MisterReaper	Bootfall (IZhO17_bootfall)	C++20	44 / 100	107 ms	2000 KiB

bootfall

#include <bits/stdc++.h>

using i64 = long long;

#ifdef DEBUG
    #include "debug.h"
#else
    #define debug(...) void(23)
#endif

template<typename T>
T power(T a, i64 b) {
    T res = 1;
    while(b) {
        if(b & 1) {
            res *= a;
        }
        a *= a;
        b >>= 1;
    }
    return res;
}
 
constexpr int md = 998244353;
struct MInt {
    int val;
    MInt() : val(0) {}
    template<typename T>
    MInt(T v) {
        if(-md <= v && v < md) {
            val = v;
        } else {
            val = v % md;
        }
        if(val < 0) {
            val += md;
        }
    }
    int operator() () { return val; }
    MInt operator+= (MInt rhs) {
        if((val += rhs.val) >= md) {
            val -= md;
        }
        return *this;
    }
    MInt operator-= (MInt rhs) {
        if((val -= rhs.val) < 0) {
            val += md;
        }
        return *this;
    }
    MInt operator*= (MInt rhs) {
        val = (int)(1LL * val * rhs.val % md);
        return *this;
    }
    MInt inv() {
        return power(*this, md - 2);
    }
    MInt operator/= (MInt rhs) {
        return *this *= rhs.inv();
    }
    bool operator== (MInt rhs) {
        return val == rhs.val;
    }
    bool operator!= (MInt rhs) {
        return val != rhs.val;
    }
};
MInt operator+ (MInt lhs, MInt rhs) {
    return lhs += rhs;
}
MInt operator- (MInt lhs, MInt rhs) {
    return lhs -= rhs;
}
MInt operator* (MInt lhs, MInt rhs) {
    return lhs *= rhs;
}
MInt operator/ (MInt lhs, MInt rhs) {
    return lhs /= rhs;
}
std::ostream& operator<< (std::ostream& os, MInt v) {
    return os << v();
}
std::string to_string(MInt x) {
    return to_string(x());
}
 
using Z = MInt;

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int N;
    std::cin >> N;
    std::vector<int> A(N + 1);
    for (int i = 0; i < N; ++i) {
        std::cin >> A[i];
    }

    bool bo[2] {};
    for (int i = 0; i < N; ++i) {
        bo[A[i] & 1] = true;
    }
    if (bo[0] && bo[1]) {
        std::cout << "0\n";
        return 0;
    } 

    int sum = std::accumulate(A.begin(), A.end(), 0);

    std::vector<Z> f(sum + 1);
    f[0] = 1;
    auto add = [&](int x) -> void {
        for (int i = sum; i >= x; --i) {
            f[i] += f[i - x];
        }
    };
    auto del = [&](int x) -> void {
        for (int i = x; i <= sum; ++i) {
            f[i] -= f[i - x];
        }
    };
    for (int i = 0; i < N; ++i) {
        add(A[i]);
    }

    if ((sum & 1) || f[sum >> 1] == 0) {
        std::cout << "0\n";
        return 0;
    }

    std::vector<int> good(sum + 1, true);
    for (int i = 0; i < N; ++i) {
        del(A[i]);
        for (int j = 1; j <= sum; ++j) {
            int x = sum - A[i] + j;
            if ((x & 1) || f[x >> 1] == 0) {
                good[j] = false;
            }
        }
        add(A[i]);
    }

    std::vector<int> ans;
    for (int i = 1; i <= sum; ++i) {
        if (good[i]) {
            ans.emplace_back(i);
        }
    }

    std::cout << ans.size() << '\n';
    for (auto i : ans) {
        std::cout << i << " \n"[i == ans.back()];
    }

    return 0;
}

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