Submission #611915

#	Time	Username	Problem	Language	Result	Execution time	Memory
611915		juggernaut	Homecoming (BOI18_homecoming)	C++14	13 / 100	1085 ms	59920 KiB

homecoming

#include<bits/stdc++.h>
#define fr first
#define sc second
using namespace std;
typedef long long ll;
typedef long double ld;
template<class T>void umax(T &a,T b){if(a<b)a=b;}
template<class T>void umin(T &a,T b){if(b<a)a=b;}
#ifdef juggernaut
    #define printl(args...) printf(args)
#else
    #define printl(args...) 0
#endif
ll solve2(int n,int k,deque<ll>A,deque<ll>B){
	vector<ll>a,b,pref,dp,cost;
	b=cost=a=pref={0};
	for(int i=0;i<2*n;i++){
		a.push_back(A[i%n]);
		pref.push_back(pref.back()+a.back());
		b.push_back(B[i%n]);
		cost.push_back(cost.back()+b.back());
	}
	dp.assign(2*n+1,0);
	for(int i=n+1;i<=2*n;i++){
		dp[i]=dp[i-1];
		for(int j=n+1;j<=i;j++)if(i-j+1>=k)
			umax(dp[i],dp[j-1]+(pref[i+1-k]-pref[j-1])-(cost[i]-cost[j-1]));
	}
	return max(dp.back(),accumulate(A.begin(),A.end(),0ll)-accumulate(B.begin(),B.end(),0ll));
}
ll solve(int n,int k,int *A,int *B){
	int N=n+2;
	ll ans=0;
	deque<ll>x,y;
	for(int i=0;i<n;i++){
		x.push_back(A[i]);
		y.push_back(B[i]);
	}
	while(N--){
		umax(ans,solve2(n,k,x,y));
		x.push_back(x.front());
		x.pop_front();
		y.push_back(y.front());
		y.pop_front();
	}
	return ans;
}
#ifdef juggernaut
int main() {
  int T; assert(scanf("%d", &T) == 1);
  for(int t = 0; t < T; t++) {
    int N, K; assert(scanf("%d%d", &N, &K) == 2);
    int *A = new int[N];
    int *B = new int[N];
    for(int i = 0; i < N; i++) assert(scanf("%d", &A[i]) == 1);
    for(int i = 0; i < N; i++) assert(scanf("%d", &B[i]) == 1);
    printf("%lld\n", solve(N, K, A, B));
    delete[] A;
    delete[] B;
  }
  return 0;
}
#endif

• Subtask 1: 13 / 13
• Subtask 2: 0 / 18
• Subtask 3: 0 / 31
• Subtask 4: 0 / 38