Submission #398463

#	Time	Username	Problem	Language	Result	Execution time	Memory
398463		qwerasdfzxcl	Lamps (JOI19_lamps)	C++14	4 / 100	13 ms	8304 KiB

lamp

#include <bits/stdc++.h>

typedef long long ll;
using namespace std;
string x, y;
int dp[1001000];

int main(){
    cin.tie(NULL);
    ios_base::sync_with_stdio(false);
    int n;
    cin >> n >> x >> y;
    int pt[2]={-1, -1}, pt2=-1;
    if (x[0]!=y[0]) dp[0]=1;
    else pt2=0;
    pt[y[0]-'0']=0;
    for (int i=1;i<n;i++){
        //printf("%d %d %d\n", pt[0], pt[1], pt2);
        if (x[i]==y[i]){
            dp[i] = dp[i-1];
            pt[y[i]-'0'] = i;
            pt2 = i;
            continue;
        }
        dp[i] = 1e9;
        if (pt2==-1) dp[i] = 1;
        else dp[i] = min(dp[i], dp[pt2]+1);
        if (pt[(y[i]-'0')^1]==-1) dp[i] = 1;
        else dp[i] = min(dp[i], dp[pt[(y[i]-'0')^1]]+1);
        pt[y[i]-'0'] = i;
    }
    cout << dp[n-1];
    return 0;
}

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