Submission #1123981

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123981		xinyubb2000	Bank (IZhO14_bank)	C++17	100 / 100	112 ms	8636 KiB

bank

#include <iostream>
#include <vector>

using std::cout;
using std::endl;
using std::vector;

int main() {
	int people_num;
	int note_num;
	std::cin >> people_num >> note_num;
	vector<int> people(people_num);
	vector<int> banknotes(note_num);
	for (int &p : people) { std::cin >> p; }
	for (int &b : banknotes) { std::cin >> b; }

	vector<int> leftover(1 << note_num, -1);
	vector<int> people_covered(1 << note_num, -1);
	leftover[0] = 0;
	people_covered[0] = 0;
	for (int s = 0; s < (1 << note_num); s++) {
		for (int last = 0; last < note_num; last++) {
			if ((s & (1 << last)) == 0) { continue; }
			int prev = s & ~(1 << last);
			if (people_covered[prev] == -1) { continue; }

			int new_amt = leftover[prev] + banknotes[last];
			// the salary of the current person we're going to try to pay
			int curr_target = people[people_covered[prev]];
			// if it's still not enough, just increment the leftover pile
            if (new_amt < curr_target) {
                if (people_covered[s] < people_covered[prev] || 
                   (people_covered[s] == people_covered[prev] && leftover[s] > new_amt)) {
                    people_covered[s] = people_covered[prev];
                    leftover[s] = new_amt;
                }
            } else if (new_amt == curr_target) {
                if (people_covered[s] < people_covered[prev] + 1 || 
                   (people_covered[s] == people_covered[prev] + 1 && leftover[s] > 0)) {
                    people_covered[s] = people_covered[prev] + 1;
                    leftover[s] = 0;
                }
            }
		}
		// we've covered all the people!
		if (people_covered[s] == people_num) {
			cout << "YES" << endl;
			return 0;
		}
	}
	cout << "NO" << endl;
}

• Subtask 1: 19 / 19
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 29 / 29