Submission #588700

#	Time	Username	Problem	Language	Result	Execution time	Memory
588700		jeroenodb	Lamps (JOI19_lamps)	C++14	4 / 100	51 ms	4160 KiB

lamp

#include "bits/stdc++.h"
using namespace std;
#define all(x) begin(x),end(x)
template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ", " << p.second << ')'; }
template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) { string sep; for (const T &x : v) os << sep << x, sep = " "; return os; }
#define debug(a) cerr << "(" << #a << ": " << a << ")\n";
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int,int> pi;
const int mxN = 1e5+1, oo = 1e9;
int main() {
    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];
    }
    int dp=0,dp2=oo,dp3=oo;
    for(int i=0;i<n;++i) {
        
        int dif = (a[i]!=b[i]);
        tie(dp,dp2,dp3) = make_tuple(min({dp+dif,dp2+b[i],dp3+!b[i]}), min(dp+2+dif,(a[i]?dp3:dp2)+b[i]),min(dp+2+!dif,(a[i]?dp2:dp3)+b[i]) );
        
        
    }
    cout << (min({dp,dp2,dp3})+1)/2;

}

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