Submission #648367

#	Time	Username	Problem	Language	Result	Execution time	Memory
648367		ymm	Lamps (JOI19_lamps)	C++17	100 / 100	65 ms	27976 KiB

lamp

#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (ll)(r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= (ll)(l); --x)
typedef long long ll;
typedef std::pair<int, int> pii;
typedef std::pair<ll , ll > pll;
using namespace std;

const int N = 1'000'010;
int dp[N][3][2];
string s, t;
int n;

void update(int i, int op, int dif)
{
	int x = dp[i][0][ '0' != t[i]] + (op != 0) + (!dif &&  '0' != t[i]);
	int y = dp[i][1][ '1' != t[i]] + (op != 1) + (!dif &&  '1' != t[i]);
	int z = dp[i][2][s[i] != t[i]] + (      0) + (!dif && s[i] != t[i]);
	dp[i+1][op][dif] = min({x, y, z});
}

int main()
{
	cin.tie(0) -> sync_with_stdio(false);
	cin >> n >> s >> t;
	Loop (i,0,n) {
		Loop (op,0,3) {
			Loop (dif,0,2) {
				update(i, op, dif);
			}
		}
	}
	cout << dp[n][2][0] << '\n';
}

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