Submission #1066033

#	Time	Username	Problem	Language	Result	Execution time	Memory
1066033		Andrey	Lamps (JOI19_lamps)	C++14	100 / 100	53 ms	21980 KiB

lamp

#include<bits/stdc++.h>
using namespace std;

int dp[1000010][3];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int n;
    cin >> n;
    vector<int> haha(n+2);
    vector<int> bruh(n+2);
    for(int i = 1; i <= n; i++) {
        char a;
        cin >> a;
        haha[i] = a-'0';
    }
    for(int i = 1; i <= n; i++) {
        char a;
        cin >> a;
        bruh[i] = a-'0';
    }
    dp[0][0] = 1e9;
    dp[0][1] = 1e9;
    dp[0][2] = 0;
    for(int i = 1; i <= n+1; i++) {
        dp[i][0] = 1e9;
        dp[i][1] = 1e9;
        dp[i][2] = 1e9;
        for(int j = 0; j < 3; j++) {
            for(int k = 0; k < 3; k++) {
                int a = haha[i-1],b = haha[i],br = dp[i-1][j];
                if(j < 2) {
                    a = j;
                }
                if(k < 2) {
                    b = k;
                }
                if((a == bruh[i-1]) != (b == bruh[i])) {
                    br++;
                }
                if(j != k) {
                    if(j == 2 || k == 2) {
                        br++;
                    }
                    else {
                        br+=2;
                    }
                }
                dp[i][k] = min(dp[i][k],br);
            }
        }
    }
    cout << dp[n+1][2]/2;
    return 0;
}

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