Submission #1192269

#TimeUsernameProblemLanguageResultExecution timeMemory
1192269ChuanChenBali Sculptures (APIO15_sculpture)C++20
100 / 100
62 ms328 KiB
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
const int inf = 2e9;
int n, A, B;
ll sv[2005];
int dp1[2005];
//dp[i] := usando [1; i], qtd minimo de grupos para o resultado seja um submask do prefixo que temos  
//dp[i] = inf <=> não consigo
bool dp2[105][105];
//dp[i][g] := true <=> consigo usar [1; i], separar em g grupos, tal que bit b é 0 e resultado é prefixo do que já tenho

ll ans;

bool isSubmask(int b, ll val){
	return (ans>>b)==((ans>>b)|(val>>b));
}

bool solve1(int b){
	for(int i = 1; i <= n; i++) dp1[i] = inf;
	for(int i = 1; i <= n; i++){
		for(int j = 0; j < i; j++){
			//[1; i] = [1; j] U [j+1; i]; 
			if(isSubmask(b, sv[i]-sv[j])) dp1[i] = min(dp1[i], dp1[j]+1);
		}
	}
	if(dp1[n] <= B) return true;
	return false;
}


bool solve2(int b){
	for(int i = 1; i <= n; i++)
		for(int g = 1; g <= n; g++)
			dp2[i][g] = false;
	for(int i = 1; i <= n; i++)
		dp2[i][1] = isSubmask(b, sv[i]);

	for(int i = 1; i <= n; i++)
		for(int g = 1; g <= i; g++) if(dp2[i][g])
			for(int x = 1; i+x <= n; x++)
				dp2[i+x][g+1] |= isSubmask(b, sv[i+x]-sv[i]);

	for(int g = A; g <= B; g++)
		if(dp2[n][g]) return true;   
	return false;
}

int main(){
    cin.tie(0)->sync_with_stdio(0);
	cin >> n >> A >> B;
	for(int i = 1; i <= n; i++){
		int a; cin >> a;
		sv[i] = sv[i-1]+a;
	}

	for(int b = 40; b >= 0; b--){
		if(A==1){
			if(!solve1(b)) ans+=(1ll<<b);
		}
		else{
			if(!solve2(b)) ans+=(1ll<<b);
		}
		
	}
	cout << ans << '\n';
}
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