Submission #640452

#	Time	Username	Problem	Language	Result	Execution time	Memory
640452		ymm	Bank (IZhO14_bank)	C++17	71 / 100	1082 ms	25928 KiB

bank

#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= (l); --x)
typedef long long ll;
typedef std::pair<int, int> pii;
typedef std::pair<ll , ll > pll;
using namespace std;

const int N = 20;
bool dp[N+1][1<<N];
int a[N], b[N];
int sum[1<<N];
int n, m;

#pragma GCC optimize("O3")
#define _gensup(i, j) \
	void gensup_##i(int x, int y, int pos) \
	{ \
		if ((x & (1<<i)) == 0) \
			gensup_##j(x, y, pos); \
		gensup_##j(x, y ^ (1<<i), pos); \
	}

void gensup_end(int x, int y, int pos)
{
	dp[pos+1][y] |= dp[pos][y^x];
	return;
}	
_gensup(0 , end)
_gensup(1 , 0)
_gensup(2 , 1)
_gensup(3 , 2)
_gensup(4 , 3)
_gensup(5 , 4)
_gensup(6 , 5)
_gensup(7 , 6)
_gensup(8 , 7)
_gensup(9 , 8)
_gensup(10, 9)
_gensup(11, 10)
_gensup(12, 11)
_gensup(13, 12)
_gensup(14, 13)
_gensup(15, 14)
_gensup(16, 15)
_gensup(17, 16)
_gensup(18, 17)
_gensup(19, 18)

void gensup(int x, int y, int i, int pos)
{
	if (i == m) {
		dp[pos+1][y] |= dp[pos][y^x];
		return;
	}
	if ((x & (1<<i)) == 0)
		gensup(x, y, i+1, pos);
	gensup(x, y ^ (1<<i), i+1, pos);
}

int main()
{
	cin.tie(0) -> sync_with_stdio(false);
	cin >> n >> m;
	Loop (i,0,n)
		cin >> a[i];
	Loop (i,0,m)
		cin >> b[i];
	memset(dp[0], 1, sizeof(dp[0]));
	Loop (i,1,1<<m)
		sum[i] = sum[i ^ (i & -i)] + b[__builtin_ctz(i)];
	void (*gensup)(int, int, int);
	switch(m) {
	case 1 : gensup = gensup_0 ; break;
	case 2 : gensup = gensup_1 ; break;
	case 3 : gensup = gensup_2 ; break;
	case 4 : gensup = gensup_3 ; break;
	case 5 : gensup = gensup_4 ; break;
	case 6 : gensup = gensup_5 ; break;
	case 7 : gensup = gensup_6 ; break;
	case 8 : gensup = gensup_7 ; break;
	case 9 : gensup = gensup_8 ; break;
	case 10: gensup = gensup_9 ; break;
	case 11: gensup = gensup_10; break;
	case 12: gensup = gensup_11; break;
	case 13: gensup = gensup_12; break;
	case 14: gensup = gensup_13; break;
	case 15: gensup = gensup_14; break;
	case 16: gensup = gensup_15; break;
	case 17: gensup = gensup_16; break;
	case 18: gensup = gensup_17; break;
	case 19: gensup = gensup_18; break;
	case 20: gensup = gensup_19; break;
	}
	Loop (i,0,n) {
		Loop (j,0,1<<m) {
			if (sum[j] == a[i])
				gensup(j, 0, i);
		}
	}
	cout << (dp[n][(1<<m)-1]? "YES": "NO") << '\n';
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:98:11: warning: 'gensup' may be used uninitialized in this function [-Wmaybe-uninitialized]
   98 |     gensup(j, 0, i);
      |     ~~~~~~^~~~~~~~~

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