Submission #566503

#	Time	Username	Problem	Language	Result	Execution time	Memory
566503		1zaid1	Bootfall (IZhO17_bootfall)	C++14	13 / 100	1083 ms	324 KiB

bootfall

#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
typedef long long ll;
#define int long long

#pragma GCC diagnostic ignored "-Wunused-result"
void setIO(string name = "") {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cout << fixed << setprecision(15);
    if (name.size()) {
    	freopen((name+".in").c_str(), "r", stdin);
        freopen((name+".out").c_str(), "w", stdout);
    }
}

const int M = 5e2+5, MOD = 1e6+7;
int sum;

bool check(vector<int>& v) {
    if (sum%2) return 0;

    vector<bool> can(2*sum+10, 0); can[0] = 1;
    for (int i = 0; i < v.size(); i++) {
        for (int k = sum/2; k >= v[i]; k--) {
            if (can[k-v[i]]) can[k] = 1;
        }
    } return can[sum/2];
}

signed main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    srand(time(0));
    // setIO("citystate");

    int n;
    cin >> n;

    vector<int> v(n);
    for (int&i:v) cin >> i;
    for (int i:v) sum += i;

    if (!check(v)) {
        cout << 0 << endl;
        return 0;
    }

    vector<int> ans;
    for (int i = 1; i <= sum; i++) {
        bool ok = 1;
        for (int j = 0; j < n; j++) {
            sum += i-v[j];
            swap(v[j], i);
            ok &= check(v);
            swap(v[j], i);
            sum -= i-v[j];
        }

        if (ok) ans.push_back(i);
    }

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

    return 0;
}

/*
4
1 3 1 5
*/

Compilation message (stderr)

bootfall.cpp: In function 'bool check(std::vector<long long int>&)':
bootfall.cpp:24:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for (int i = 0; i < v.size(); i++) {
      |                     ~~^~~~~~~~~~
bootfall.cpp: In function 'int main()':
bootfall.cpp:63:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   63 |     for (int i:ans) cout << i << ' '; cout << endl;
      |     ^~~
bootfall.cpp:63:39: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   63 |     for (int i:ans) cout << i << ' '; cout << endl;
      |                                       ^~~~

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