Submission #485625

#	Time	Username	Problem	Language	Result	Execution time	Memory
485625		keertan	Bank (IZhO14_bank)	C++17	100 / 100	122 ms	8524 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++) {
        bool ok=0;
        int valo=-1;
		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 (valo==-1){valo= new_amt;}
                else if (valo!= new_amt){cout<<"fuck";}
				people_covered[s] = people_covered[prev];
				leftover[s] = new_amt;
			}
			/*
			 * or it's exactly right, in which case reset the leftover count
			 * and increment the covered amount
			 */
			else if (new_amt == curr_target) {
				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;
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:26:14: warning: unused variable 'ok' [-Wunused-variable]
   26 |         bool ok=0;
      |              ^~

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