Submission #452002

#	Time	Username	Problem	Language	Result	Execution time	Memory
452002		dxz05	Bootfall (IZhO17_bootfall)	C++14	44 / 100	296 ms	1008 KiB

bootfall

#pragma GCC optimize("Ofast,O2,O3")
#pragma GCC target("avx2")

#include <bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define revall(x) (x).rbegin(), (x).rend()

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.00001;
const int MOD = 1e9;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 2e6 + 3e2;
const int M = 1024;

int a[N];
int cnt[N];
void solve(int TC) {
    int n;
    cin >> n;

    const int MAXX = 270*270 + 1;
    bitset<MAXX> b;
    b[0] = 1;
    int sum = 0;
    for (int i = 1; i <= n; i++){
        cin >> a[i];
        sum += a[i];
        b |= b << a[i];
    }

    if (sum % 2 || !b[sum / 2]){
        cout << 0;
        return;
    }

    for (int i = 1; i <= n; i++){
        b.reset();
        b[0] = 1;
        for (int j = 1; j <= n; j++){
            if (i != j) b |= b << a[j];
        }
        for (int j = 1; j < MAXX; j++){
            int x = 2 * j - sum + a[i];
            if (b[j] && x > 0) cnt[x]++;
        }
    }

    vector<int> ans;
    for (int i = 1; i < MAXX; i++){
        if (cnt[i] == n) ans.push_back(i);
    }

    cout << ans.size() << endl;
    for (int x : ans) cout << x << ' ';

}

int main() {
    startTime = clock();
    cin.tie(nullptr);
    cout.tie(nullptr);
    ios_base::sync_with_stdio(false);

    bool llololcal = false;
#ifdef dddxxz
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    llololcal = true;
#endif

    int TC = 1;
    //cin >> TC;

    for (int test = 1; test <= TC; test++) {
        debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

    if (llololcal) cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;

    return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:19:20: warning: statement has no effect [-Wunused-value]
   19 | #define debug(...) 42
      |                    ^~
bootfall.cpp:103:9: note: in expansion of macro 'debug'
  103 |         debug(test);
      |         ^~~~~

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