Submission #967135

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
967135	2024-04-21 09:05:18	ttamx	Lamps (JOI19_lamps)	C++17	4 / 100	112 ms	27832 KiB

lamp

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#include<bits/stdc++.h>
using namespace std;
const int N=1e6+5;
int n;
char a[N],b[N];
int dp[N][3][2];
int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> (a+1) >> (b+1);
    for(int i=0;i<=n;i++)for(int j=0;j<3;j++)for(int k=0;k<2;k++)dp[i][j][k]=2*n;
    dp[0][0][0]=0;
    for(int i=1;i<=n;i++)for(int j=0;j<3;j++)for(int k=0;k<3;k++)for(int tl=0;tl<2;tl++)for(int tr=0;tr<2;tr++){
        if(j&&k&&j!=k)continue;
        int v=a[i]-'0';
        if(j)v=j-1;
        else if(k)v=k-1;
        v^=tl;
        if(v==b[i]-'0')dp[i][k][tr]=min(dp[i][k][tr],dp[i-1][j][tl]+(j!=k)+(tl!=tr));
        else dp[i][k][tr]=min(dp[i][k][tr],dp[i-1][j][tl]+(j!=k)+(tl!=tr)+2);
    }
    cout << dp[n][0][0]/2;
}
 
 
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• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 4 / 4
• Subtask 4: 0 / 49