Submission #1085133

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085133		pacman	Bank (IZhO14_bank)	C++14	0 / 100	2 ms	348 KiB

bank

#include <bits/stdc++.h>
#define int long long int

using namespace std;

const int maxn = 1 << 21, inf = 1e18;

int n, m, sallary[21],money[21], cover[maxn], left_money[maxn];

int32_t main(){
	
	freopen("bank.in","r",stdin);
	freopen("bank.out","w",stdout);
	
	ios::sync_with_stdio(0) ,cout.tie(0) ,cin.tie(0);
	
	cin >> n >> m;
	for(int i = 0 ;i < n; i++){
		cin >> sallary[i];
	}
	for(int i = 0 ;i < m;i++){
		cin >> money[i];
	}
	
	for(int i = 0 ; i <= (1 << m); i++){
		cover[i] = -inf;
		left_money[i] = -inf;
	}
	
	cover[0] = 0;
	left_money[0] = 0;
	for(int i = 0 ;i < (1 << m); i++){
		int mask = i;
		
		while(mask > 0){
			int j = __builtin_ctz(mask);
			int ghabli = i & ~(1 << j);
			
			if(cover[ghabli] == -inf){
				mask ^= (1 << j);
				continue;
			}
			int now_money = left_money[ghabli] + money[j];
			int want_money = sallary[cover[ghabli]];
			
			if(now_money < want_money){
				cover[i] = cover[ghabli];
				left_money[i] = now_money;
			}
			else if(now_money == want_money){
				cover[i] = cover[ghabli] + 1;
				left_money[i] = 0;
			}
			
			mask ^= (1 << j);
		}
		if(cover[i] == n){
			cout << "YES" << endl;
			return 0;
		}
	}
	
	cout << "NO" << endl;
	
	return 0;
}

Compilation message (stderr)

bank.cpp: In function 'int32_t main()':
bank.cpp:12:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  freopen("bank.in","r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
bank.cpp:13:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  freopen("bank.out","w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 19
• Subtask 2: 0 / 25
• Subtask 3: 0 / 27
• Subtask 4: 0 / 29