Submission #754287

#	Time	Username	Problem	Language	Result	Execution time	Memory
754287		Olympia	Bootfall (IZhO17_bootfall)	C++17	13 / 100	1068 ms	320 KiB

bootfall

#include <vector>
#include <iostream>
#include <cassert>
#include <cmath>
#include <map>
#include <bitset>
#include <set>
#include <stack>
using namespace std;
bool okay (vector<int> v) {
	int sum = 0;
	for (int i: v) {
		sum += i;
	}
	if (sum % 2 == 1) {
		return false;
	}
	bitset<5000> bs;
	bs[0] = true;
	for (int i: v) {
		bs |= (bs << i);
	}
	return bs[sum/2];
}
vector<int> remove (vector<int> v, int ind) {
	vector<int> a;
	for (int i = 0; i < v.size(); i++) {
		if (i != ind) {
			a.push_back(v[i]);
		}
	}
	return a;
}
int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    vector<int> v(n);
    for (int i = 0; i < n; i++) {
    	cin >> v[i];
    }
    bitset<5000> bs;
    bs[0] = true;
    for (int i = 0; i < n - 1; i++) {
    	bs |= (bs >> v[i]) | (bs << v[i]);
    }
    vector<int> ans;
    for (int i = 0; i <= 5000; i++) {
    	if (!bs[i]) {
    		continue;
    	}
    	v.push_back(i);
    	bool fine = true;
    	for (int j = 0; j < v.size(); j++) {
    		if (!okay(remove(v, j))) {
    			fine = false;
    			break;
    		}
    	}
    	if (fine) {
    		ans.push_back(i);
    	}
    	v.pop_back();
    }
    cout << ans.size() << endl;
    for (int i: ans) {
    	cout << i << ' ';
    }
    cout << endl;
}

Compilation message (stderr)

bootfall.cpp: In function 'std::vector<int> remove(std::vector<int>, int)':
bootfall.cpp:27:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |  for (int i = 0; i < v.size(); i++) {
      |                  ~~^~~~~~~~~~
bootfall.cpp: In function 'int main()':
bootfall.cpp:55:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |      for (int j = 0; j < v.size(); j++) {
      |                      ~~^~~~~~~~~~

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