Submission #1074751

#	Time	Username	Problem	Language	Result	Execution time	Memory
1074751		socpite	Uplifting Excursion (BOI22_vault)	C++17	80 / 100	5033 ms	6488 KiB

vault

#include<bits/stdc++.h>
using namespace std;

const long long INF = 1e18;
const int maxn = 305;

long long A[2*maxn], inp[2*maxn];

int bs_A[2*maxn][65];

long long dp[4*maxn*maxn];
long long tmp[4*maxn*maxn];

int main(){
	int m;
	long long L;
	cin >> m >> L;
	for(int i = 0; i <= 2*m; i++)cin >> A[i];
	if(L < 0){
		L*=-1;
		for(int i = 1; i <= m; i++)swap(A[m-i], A[m+i]);
	}
	for(int i = 0; i <= 2*m; i++){
		if(i == m)continue;
		for(int j = 0; j <= 60; j++){
			if(A[i] == 0)break;
			bs_A[i][j] = A[i]&1 ? 1 : 2;
			A[i] = (A[i]-1)/2;
		}
	}
	int sum = m*(m+1)*2;
	memset(dp, -1, sizeof(dp));
	dp[sum] = 0;
	for(int b = 0; b <= 60; b++){
		for(int i = 1; i <= m; i++){
			memset(tmp, -1, sizeof(tmp));
			for(int j = 0; j <= 2*sum; j++){
				if(dp[j] == -1)continue;
				for(int p_val = 0; p_val <= bs_A[m+i][b]; p_val++){
					for(int n_val = 0; n_val <= bs_A[m-i][b]; n_val++){
						int nw = j + (p_val - n_val)*i;
						long long cost = p_val + n_val;
						cost <<= b;
						assert(0 <= nw && nw <= 2*sum);
						tmp[nw] = max(tmp[nw], dp[j] + cost);
					}
				}
			}
			memcpy(dp, tmp, sizeof(dp));
		}
		for(int j = 0; j <= 2*sum; j++)tmp[j] = -1; 
		for(int i = 0; i <= 2*sum; i++){
			if(((i&1)^(sum&1)) != ((L>>b)&1))continue;
			int ri = i - sum, pos;
			if(ri < 0)pos = (ri-1)/2 + sum;
			else pos = ri/2 + sum;
			assert(pos >= 0 && pos <= 2*sum);
			tmp[pos] = max(tmp[pos], dp[i]);
		}
		for(int i = 0; i <= 2*sum; i++)dp[i] = tmp[i];
	}
	if(dp[sum] == -1)cout << "impossible";
	else cout << dp[sum] + A[m];
}

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3-1: 10 / 10
• Subtask 3-2: 10 / 10
• Subtask 4-1: 10 / 10
• Subtask 4-2: 10 / 10
• Subtask 5-1: 10 / 10
• Subtask 5-2: 10 / 10
• Subtask 6-1: 0 / 10
• Subtask 6-2: 0 / 10