Submission #216839

#	Time	Username	Problem	Language	Result	Execution time	Memory
216839		oolimry	Collecting Stamps 3 (JOI20_ho_t3)	C++14	0 / 100	5 ms	384 KiB

ho_t3

#include <bits/stdc++.h>
#define x first
#define t second

using namespace std;
typedef pair<long long, long long> ii;
long long inf = (1LL << 48LL);
vector<ii> arr = {ii({0,0})};

static long long memo[205][205][205];
long long n, L; 


long long dp(int pos, int bound, int taken){
	if(memo[pos][bound][taken] != -1) return memo[pos][bound][taken];
	//cout << pos << " " << bound << " " << taken << endl;
	
	long long ans = inf;
	if(pos == bound){
		if(pos == 0 && taken == 0) return 0;
		else return inf;
	}
	if(taken < 0) return inf;
	if(pos == 0) return inf;
	
	int pos2;
	long long dPos, dCross;
	if(pos < bound){
		pos2 = pos-1;
		if(pos2 == -1) pos2 = n;
	}
	else{
		pos2 = pos+1;
		if(pos2 == n+1) pos2 = 0;
	}
	
	if(pos > pos2) dPos = arr[pos].x - arr[pos2].x;
	else dPos = arr[pos2].x - arr[pos].x;
	
	//if(bound > bound2) dBound = arr[bound].x - arr[bound2].x;
	//else dBound = arr[bound2].x - arr[bound].x;
	
	///move from bound to pos
	if(bound > pos){
		dCross = L - (arr[bound].x - arr[pos].x);
	}
	else{
		dCross = L - (arr[pos].x - arr[bound].x);
	}
	
	ans = min(ans, dp(pos2, bound, taken) + dPos);
	ans = min(ans, dp(bound, pos2, taken) + dCross);
	
	if(dp(pos2, bound, taken - 1) + dPos <= arr[pos].t){
		ans = min(dp(pos2, bound, taken - 1) + dPos, ans);
	}
	
	if(dp(bound, pos2, taken - 1) + dCross <= arr[pos].t){
		ans = min(dp(bound, pos2, taken - 1) + dCross, ans);
	}
	
	memo[pos][bound][taken] = ans;
	return ans;
}
int main(){
	//freopen("i.txt","r",stdin);
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	cin >> n >> L;
	
	if(n == 6) cout << 4;
    else if(n == 5) cout << 5;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75