Submission #1039500

#	Time	Username	Problem	Language	Result	Execution time	Memory
1039500		coolsentenceidontremember	Bank (IZhO14_bank)	C++17	100 / 100	86 ms	8792 KiB

bank

#include<bits/stdc++.h>

#pragma GCC optimize("O3", "unroll-loops")


#define ll long long
#define ld long double
#define ff first
#define ss second
#define db double
#define time_begin() auto begin = chrono::high_resolution_clock::now()
#define time_end() auto end = chrono::high_resolution_clock::now(); auto elapsed = chrono::duration_cast<chrono::nanoseconds>(end-begin); auto sec = elapsed.count() * 1e-9; cerr << "\n\nExecution time: " << sec << " seconds";
#define check_time() cerr << "\nStatus : "; if (sec>1) cerr << "Time Limit Exceeded 1!!!1!111"; else cerr << "You good brother"

using namespace std;

void setIO(string s = ""){
 ios_base::sync_with_stdio(false);
 cin.tie(nullptr);
 cout.tie(nullptr);
 if (!s.empty()){
	freopen((s+".in").c_str(), "r", stdin);
	freopen((s+".out").c_str(), "w", stdout);
	}
}




int main(){
   setIO();
   int n, m;
   cin >> n >> m;
   int ppl[n], bank[m];
   for (int &i : ppl) cin >> i;
   for (int &i : bank) cin >> i;
   vector<int> left(1<<m, 0), cover(1<<m, -1);
   cover[0] = 0;
   for (int mask = 0; mask < (1<<m); mask++){
   	 for (int b = 0; b < m; b++){
   	 	if (mask & (1<<b)){
   	 		int prev = mask^(1<<b);
   	 		if (cover[prev] == -1) continue;
   	 		int target = ppl[cover[prev]];
   	 		int cur_tenge = left[prev]+bank[b];
   	 		if (cur_tenge < target){
   	 			left[mask] = cur_tenge;
   	 			cover[mask] = cover[prev];
				} else if (cur_tenge==target){
					cover[mask] = cover[prev]+1;
					left[mask] = 0;
				}
			}
		}
		if (cover[mask] == n){
			cout << "YES";
			return 0;
		}
   }
   return cout << "NO", 0;
}

Compilation message (stderr)

bank.cpp: In function 'void setIO(std::string)':
bank.cpp:22:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |  freopen((s+".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:23:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |  freopen((s+".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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