Submission #463846

#	Time	Username	Problem	Language	Result	Execution time	Memory
463846		ignaciocanta	Bank (IZhO14_bank)	C++14	100 / 100	136 ms	8524 KiB

bank

#include <bits/stdc++.h>
 
using namespace std;
 
//#include <ext/pb_ds/assoc_container.hpp>
//using namespace __gnu_pbds;
//template<class T> using Tree = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
 
using tint = long long;
using ld = long double;
 
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)	
 
using pi = pair<int,int>;
using pl = pair<tint,tint>;
using vi = vector<int>;
using vl = vector<tint>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vvi = vector<vi>;
using vvl = vector<vl>;
using vb = vector<bool>;
 
#define pb push_back
#define pf push_front
#define rsz resize
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sz(x) (int)(x).size()
#define ins insert
 
#define f first
#define s second
#define mp make_pair
 
#define DBG(x) cerr << #x << " = " << x << endl;
 
const int MOD = 1e9+7; 
const int mod = 998244353;
const int MX = 21;
const tint INF = 1e18; 
const int inf = 1e9;
const ld PI = acos(ld(-1)); 
const ld eps = 1e-5;
 
const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};
 
template<class T> void remDup(vector<T> &v){ 
	sort(all(v)); v.erase(unique(all(v)),end(v));
}
 
template<class T> bool ckmin(T& a, const T& b) {
	return b < a ? a = b, 1 : 0; 
} 
template<class T> bool ckmax(T& a, const T& b) {
	return a < b ? a = b, 1 : 0; 
}
 
bool valid(int x, int y, int n, int m){
	return (0<=x && x<n && 0<=y && y<m);
}
 
int cdiv(int a, int b) { return a/b+((a^b)>0&&a%b); } //redondea p arriba
int fdiv(int a, int b) { return a/b-((a^b)<0&&a%b); } //redondea p abajo
 
void NACHO(string name = ""){
	ios_base::sync_with_stdio(0); cin.tie(0);
	if(sz(name)){
		freopen((name+".in").c_str(), "r", stdin);
		freopen((name+".out").c_str(), "w", stdout);
	}
}

int a[MX], b[MX];
pi dp[1<<MX];
// max. prefix I can cover with this mask and amount of money
// left if I pay this prefix.

int main(){
	NACHO();
	int n, m; cin >> n >> m;
	F0R(i, n) cin >> a[i];
	F0R(i, m) cin >> b[i];
	F0R(i, 1<<m) dp[i] = mp(0, -inf);
	dp[0] = mp(0, 0);
	F0R(i, 1<<m){
		F0R(j, m){
			if((i&(1<<j)) == 0) continue;
			int pre = dp[i^(1<<j)].f, lft = dp[i^(1<<j)].s;
			if(b[j] + lft == a[pre]){
				if(pre + 1 > dp[i].f) dp[i] = mp(pre + 1, 0);
			}else{
				if(pre > dp[i].f || (pre == dp[i].f && lft + b[j] > dp[i].s)) dp[i] = mp(pre, lft + b[j]);
			}
		}
	}
	if(dp[(1<<m) - 1].f == n) cout << "YES" << "\n";
	else cout << "NO" << "\n";
}

Compilation message (stderr)

bank.cpp: In function 'void NACHO(std::string)':
bank.cpp:74:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |   freopen((name+".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:75:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |   freopen((name+".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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