Submission #38504

#	Time	Username	Problem	Language	Result	Execution time	Memory
38504		grumpy_gordon	Bootfall (IZhO17_bootfall)	C++14	13 / 100	6 ms	17808 KiB

bootfall

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#include <bits/stdc++.h>

//#pragma GCC optimize("O3")
//#pragma GCC optimize("Ofast,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx")
//#pragma GCC target("avx,tune=native")

using namespace std;

typedef long long ll;

typedef unsigned long long ull;

typedef long double ld;

int mysqrt(ll x){
    int l = 0, r = 1e9 + 1;
    while (r - l > 1){
        int m = (l + r) / 2;
        if (m * (ll)m <= x)
            l = m;
        else
            r = m;
    }
    return l;
}

mt19937 rnd(1337);

ll AR = 19, BR = 13, CR = 23, XR = 228, YR = 322, MODR = 1e9 + 993;

ll myrand(){
    ll ZR = (XR * AR + YR * BR + CR) % MODR;
    XR = YR;
    YR = ZR;
    return ZR;
}

const int Mod = 1e9 + 7;

int bpow(int x, int y){
    if (y == 0)
        return 1;
    if (y == 1)
        return x;
    int ret = bpow(x, y >> 1);
    ret = (ret * (ll)ret) % Mod;
    if (y & 1)
        ret = (ret * (ll)x) % Mod;
    return ret;
}

int bdiv(int x, int y){
    return (x * (ll)bpow(y, Mod - 2)) % Mod;
}

void setmin(int &x, int y){
    x = min(x, y);
}

void setmax(int &x, int y){
    x = max(x, y);
}

const ll llinf = 1e18 + 100;

const int maxn = 1e5 + 100, inf = 2e9 + 100, sq = 2000, mod = 1e9 + 7, LG = 17;

ull q[500 * 500 + 1][8];

int n, a[500];

int main()
{
    #ifdef ONPC
    //ifstream cin("a.in");
    //ofstream cout("a.out");
    freopen("a.in", "r", stdin);
    freopen("a.out", "w", stdout);
    #else
    //ifstream cin("bootfall.in");
    //ofstream cout("bootfall.out");
    //freopen("trap.in", "r", stdin);
    //freopen("trap.out", "w", stdout);
    #endif // ONPC
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    for (int i = 0; i < n; i++)
        q[0][i >> 6] |= (1ll << (i & 63));
    int W = 0;
    for (int i = 0; i < n; i++){
        cin >> a[i];
        W += a[i];
    }
    for (int i = 1; i < n; i++)
    if ((a[i] & 1) != (a[0] & 1)){
        cout << 0 << '\n';
        return 0;
    }
    for (int i = 0; i < n; i++){
        for (int j = W; j >= a[i]; j--){
            bool z = q[j][i >> 6] & (1ll << (i & 63));
            for (int k = 0; k < 8; k++)
                q[j][k] |= q[j - a[i]][k];
            if (!z && (q[j][i >> 6] & (1ll << (i & 63))))
                q[j][i >> 6] ^= (1ll << (i & 63));
        }
    }
    if (W & 1){
        cout << 0;
        return 0;
    }
    int ss = 0;
    for (int i = 0; i < 8; i++)
    if (q[W / 2][i]){
        ss = 1;
        break;
    }
    if (!ss){
        cout << 0 << '\n';
        return 0;
    }
    vector<int> ans;
    for (int k = 1; k <= W; k++)
    if ((k & 1) == (a[0] & 1)){
        bool is = 1;
        for (int i = 0; i < n && is; i++)
            if (((W + k - a[i]) / 2 > W || !(q[(W + k - a[i]) / 2][i >> 6] & (1ll << (i & 63)))) && (W - k - a[i] < 0 || !(q[(W - k - a[i]) / 2][i >> 6] & (1ll << (i & 63)))))
                is = 0;
        if (is)
            ans.push_back(k);
    }
    cout << ans.size() << '\n';
    for (auto i : ans)
        cout << i << ' ';
}

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