Submission #754547

#	Time	Username	Problem	Language	Result	Execution time	Memory
754547		Olympia	Bootfall (IZhO17_bootfall)	C++17	0 / 100	1 ms	212 KiB

bootfall

#include <vector>
#include <iostream>
#include <cassert>
#include <random>
#include <cmath>
#include <map>
#include <algorithm>
#include <bitset>
#include <set>
#include <stack>
using namespace std;
vector<int> cnt; //cnt[i] is number of ways to achieve sum of i
int sum = 0;
void print () {
	for (int x: cnt) {
		cout << x << ' ';
	}
	cout << endl;
}
void add (int x) {
	//cout << "ADD " << x << endl;
	sum += x;
	for (int i = (int)cnt.size() - 1; i >= x; i--) {
		cnt[i] += cnt[i - x];
	}
}
void rem (int x) {
	//cout << "REM " << x << endl;
	sum -= x;
	for (int i = 0; i <= (int)cnt.size() - x - 1; i++) {
		cnt[i + x] -= cnt[i];
	}
}
int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cnt.assign(50, 0);
    cnt[0] = 1;
    int n;
    cin >> n;
    vector<int> v(n);
    for (int i = 0; i < n; i++) {
    	cin >> v[i];
    	add(v[i]);
    }
    vector<int> ans;
    for (int i = 1; i < 10; i++) {
    	bool fine = true;
    	if (sum % 2 != 0 or !cnt[sum/2]) {
    		fine = false;
    	}
    	add(i);
    	for (int j = 0; j < v.size(); j++) {
    		rem(v[j]);
    		if (sum % 2 == 1 or !cnt[sum/2]) {
    			fine = false;
    		}
    		add(v[j]);
    	}
    	rem(i);
    	if (fine) {
    		ans.push_back(i);
    	}
    }
    cout << ans.size() << endl;
    for (int i: ans) {
    	cout << i << ' ';
    }
    cout << endl;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:53:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |      for (int j = 0; j < v.size(); j++) {
      |                      ~~^~~~~~~~~~

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