Submission #671827

#	Time	Username	Problem	Language	Result	Execution time	Memory
671827		Alihan_8	Bootfall (IZhO17_bootfall)	C++17	28 / 100	63 ms	992 KiB

bootfall

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define int long long
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n; cin >> n;
    vector <int> p(n);
    for ( auto &i: p ) cin >> i;
    int sum = accumulate(all(p), 0ll);
    vector <int> dp(sum+1); dp[0] = 1;
    for ( auto val: p ){
        for ( int j = sum; j >= val; j-- ) dp[j] += dp[j-val];
    }
    if ( sum & 1 or !dp[sum >> 1] ){
        cout << "0\n";
        return 0;
    }
    const int N = 25001;
    vector <int> cnt(N), ans;
    for ( auto val: p ){
        for ( int j = val; j <= sum; j++ ) dp[j] -= dp[j-val];
        for ( int i = 1; i <= sum-val; i++ ){
            int cur = sum-val+i;
            if ( cur & 1 or !dp[cur/2-i] ) continue;
            if ( ++cnt[i] == n ) ans.pb(i);
        }
        for ( int j = sum; j >= val; j-- ) dp[j] += dp[j-val];
    }
    sort(all(ans));
    cout << (int)ans.size() << ln;
    for ( auto i: ans ) cout << i << ' ';

    cout << '\n';
}

Compilation message (stderr)

bootfall.cpp: In function 'void IO(std::string)':
bootfall.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bootfall.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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