Submission #716504

#	Time	Username	Problem	Language	Result	Execution time	Memory
716504		lukameladze	Lamps (JOI19_lamps)	C++14	100 / 100	47 ms	16056 KiB

lamp

// 1. SET  2. switches
// dp[i][j] ---> j = 1  set 0;  j = 2 set 1;  j = 0  X 
# include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
// #define int long long
#define pii pair <int, int>
#define pb push_back
const int N = 1e6 + 5, inf = 1e9;
int t,n,a[N],dp[N][3];
string s,s1;
main() {
	std::ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
	cin>>n>>s>>s1;
	s = "@" + s; s1 = "@" + s1;
	for (int i = 0; i <= n; i++) for (int j = 0; j <= 2; j++) dp[i][j] = inf;
	dp[0][0] = 0;
	for (int i = 1; i <= n; i++) {
		for (int j = 0; j < 3; j++) {
			for (int k = 0; k < 3; k++) {
				int cur, pre;
				if (j) cur = j - 1;
				else cur = (int)(s[i] - '0');
				if (k) pre = k - 1;
				else pre = (int)(s[i - 1] - '0');
				dp[i][j] = min(dp[i][j], dp[i - 1][k] + (j && j != k) + (pre == (int)(s1[i - 1] - '0') && cur != (int)(s1[i] - '0')));
			}
		}
	}
	cout<<min(dp[n][0], min(dp[n][1], dp[n][2]))<<"\n";
}

Compilation message (stderr)

lamp.cpp:13:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   13 | main() {
      | ^~~~

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