Submission #588708

#	Time	Username	Problem	Language	Result	Execution time	Memory
588708		jeroenodb	Lamps (JOI19_lamps)	C++14	100 / 100	15 ms	2800 KiB

lamp

#include "bits/stdc++.h"
using namespace std;
const int oo = 1e9;

int main() {
    cin.tie(NULL)->sync_with_stdio(false);
    int n; cin >> n;
    string a,b; cin >> a >> b;
    for(auto& i : a) i-='0';
    for(auto& i : b) i-='0';
    for(int i=n-1;i>0;--i) {
        a[i]^=a[i-1];
        b[i]^=b[i-1];
    }
    array<int,3> dp = {0,oo,oo};
    for(int i=0;i<n;++i) {
        int dif = (a[i]!=b[i]);
        dp = {min({dp[0]+dif,dp[1]+dif,dp[2]+!dif}), min(dp[0]+2+dif,dp[1+a[i]]+b[i]),min(dp[0]+2+!dif,dp[1+!a[i]]+b[i])};
    }
    cout << (min({dp[0],dp[1],dp[2]})+1)/2;

}

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