Submission #829334

#	Time	Username	Problem	Language	Result	Execution time	Memory
829334		QwertyPi	Uplifting Excursion (BOI22_vault)	C++14	0 / 100	0 ms	340 KiB

vault

#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
#define int long long

using namespace std;

const int M = 300 + 11;
const int X = M * M;
const int INF = 1LL << 60;
int a[M * 2];
int s[M * 2];
int dp[M * 2][X];

int norm(int x, int m){
	if(x >= 0) return x;
	return (x % m + m) % m;
}

int32_t main(){
	int m, L; cin >> m >> L;
	for(int i = 0; i <= m * 2; i++) cin >> a[i];
	
	int ans = a[m];
	for(int i = m + 1; i <= m * 2; i++) s[i] = min(L, s[i - 1] + (i - m) * a[i]);

	for(int i = m; i <= m * 2; i++){
		for(int j = 0; j <= m * (i - 1 - m); j++){
			dp[i][j] = -INF;
		}
	}
	dp[m][0] = 0;
	for(int i = m + 1; i <= m * 2; i++){
		for(int j = 0; j <= m * (i - 1 - m); j++){
			int left = norm(s[i] - s[i - 1] + j - a[i] * (i - m), i - m);
			int right = min(s[i] - s[i - 1] + j, m * (i - m));
			int inc = i - m;
			// int delta = ((s[i] - left) - (s[i - 1] - j)) / (i - m);
			for(int k = left; k <= right; k += inc){
				int vj = s[i - 1] - j, vk = s[i] - k;
				if(vj > vk) break;
				if((vk - vj) / (i - m) > a[i]) continue;
				dp[i][k] = max(dp[i][k], dp[i - 1][j] + (vk - vj) / (i - m));
				// delta--;
			}
		}
	}
	if(s[m * 2] < L || L < 0){
		cout << "impossible" << endl;
		return 0;
	}
	if(dp[m * 2][0] < 0){
		cout << "impossible" << endl;
	}else{
		cout << ans + dp[m * 2][0] << endl;
	}
}

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