Submission #941921

#	Time	Username	Problem	Language	Result	Execution time	Memory
941921		maxFedorchuk	Lamps (JOI19_lamps)	C++17	4 / 100	53 ms	14140 KiB

lamp

#include <bits/stdc++.h>
using namespace std;
 
#define MIN(a, b) a = min(a, b)
 
int n, dp[1000005][3]; string A, B;
 
int main()
{
    cin >> n >> A >> B; 
    A = " " + A; B = " " + B;

    memset(dp, 0x3f, sizeof(dp)); 

    dp[0][0] = 0;
    for (int i = 1; i <= n; i++) 
        for (int j : {0, 1, 2})
        {
            bool eq = (!j and A[i] == B[i]) or (j - 1 == B[i] - '0');
            int &DP = dp[i][j];

            MIN(DP, dp[i - 1][0] + min(1,(A[i - 1] == B[i - 1]) * !eq + (j == 1 or j == 2)));
            MIN(DP, dp[i - 1][1] + (i == 1 or B[i - 1] == '0') * !eq + (j == 2));
            MIN(DP, dp[i - 1][2] + (i == 1 or B[i - 1] == '1') * !eq + (j == 1));
        }
        
    cout<<min({dp[n][0], dp[n][1], dp[n][2]})<<endl;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 4 / 4
• Subtask 4: 0 / 49