Submission #937598

#	Time	Username	Problem	Language	Result	Execution time	Memory
937598		WonderfulWhale	Lamps (JOI19_lamps)	C++17	100 / 100	334 ms	83012 KiB

lamp

#include<bits/stdc++.h>
using namespace std;
 
#define int int64_t
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
 
int dp[1000009][2][5];
 
int dis[5][5] = {
	{0, 1, 1, 2, 2},
	{0, 0, 1, 1, 2},
	{0, 1, 0, 2, 1},
	{0, 0, 0, 0, 1},
	{0, 0, 0, 1, 0}
};
 
int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
 
 
	int n;
	cin >> n;
	for(int i=0;i<=n;i++) {
		for(int j=0;j<5;j++) {
			dp[i][0][j] = dp[i][1][j] = 1e9;
		}
	}
	dp[0][0][0] = 0;
	string A, B;
	cin >> A >> B;
	for(int i=1;i<=n;i++) {
		for(int j1=0;j1<2;j1++) {
			for(int j2=0;j2<5;j2++) {
				for(int k1=0;k1<2;k1++) {
					for(int k2=0;k2<5;k2++) {
						int New = A[i-1]-'0';
						if(k2==2||k2==3) New = 1;
						if(k2==1||k2==4) New = 0;
						if(k1) New = 1-New;
						if(New!=B[i-1]-'0') continue;
						bool is = k1&&(!j1);
						dp[i][k1][k2] = min(dp[i][k1][k2], 
								dp[i-1][j1][j2]+is+dis[j2][k2]);
					}
				}
			}
		}
	}
	int ans = 1e9;
	for(int i=0;i<5;i++)
		ans = min({ans, dp[n][0][i], dp[n][1][i]});
	cout << ans << "\n";
}

• Subtask 1: 6 / 6
• Subtask 2: 41 / 41
• Subtask 3: 4 / 4
• Subtask 4: 49 / 49