oj.uz

Submission #206007

# Submission time Handle Problem Language Result Execution time Memory
206007 2020-03-01T23:07:16 Z mode149256 Lamps (JOI19_lamps) C++14
4 / 100
 84 ms 59084 KB 
/*input
8
11011100
01101001
*/
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;

typedef vector<int> vi;
typedef vector<vi> vii;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<vl> vll;
typedef vector<pi> vpi;
typedef vector<vpi> vpii;
typedef vector<pl> vpl;
typedef vector<cd> vcd;
typedef vector<pd> vpd;
typedef vector<bool> vb;
typedef vector<vb> vbb;
typedef std::string str;
typedef std::vector<str> vs;

#define x first
#define y second
#define debug(...) cout<<"["<<#__VA_ARGS__<<": "<<__VA_ARGS__<<"]\n"

const int MOD = 1000000007;
const ll INF = std::numeric_limits<ll>::max();
const int MX = 100101;
const ld PI = 3.14159265358979323846264338327950288419716939937510582097494L;

template<typename T>
pair<T, T> operator+(const pair<T, T> &a, const pair<T, T> &b) { return pair<T, T>(a.x + b.x, a.y + b.y); }
template<typename T>
pair<T, T> operator-(const pair<T, T> &a, const pair<T, T> &b) { return pair<T, T>(a.x - b.x, a.y - b.y); }
template<typename T>
T operator*(const pair<T, T> &a, const pair<T, T> &b) { return (a.x * b.x + a.y * b.y); }
template<typename T>
T operator^(const pair<T, T> &a, const pair<T, T> &b) { return (a.x * b.y - a.y * b.x); }

template<typename T>
void print(vector<T> vec, string name = "") {
	cout << name;
	for (auto u : vec)
		cout << u << ' ';
	cout << '\n';
}

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	int N;
	str A, B;
	cin >> N >> A >> B;


	vii dp(N, vi(3, MOD));
	// 0 - done
	// 1 - ones
	// 2 - zeroes

	dp[0][0] = (A[0] != B[0]);
	dp[0][1] = 1 + (B[0] == '0');
	dp[0][2] = 1 + (B[0] == '1');

	for (int i = 1; i < N; ++i)
	{
		// pildom [0]
		dp[i][0] = min(dp[i][0], dp[i - 1][0] + (A[i] != B[i] and A[i - 1] == B[i - 1]));
		dp[i][0] = min(dp[i][0], dp[i - 1][1] + (A[i] != B[i]));
		dp[i][0] = min(dp[i][0], dp[i - 1][2] + (A[i] != B[i]));
		// dp[i][0] = min(dp[i][0], dp[i - 1][0] + (A[i] != B[i] and A[i - 1] == B[i - 1]));
		// dp[i][0] = min(dp[i][0], dp[i - 1][2] + (B[i] == '1' and B[i - 1] != '1'));

		// pildom [1]
		dp[i][1] = min(dp[i][1], dp[i - 1][0] + 1 + (B[i] == '0'));
		dp[i][1] = min(dp[i][1], dp[i - 1][1] + (B[i] == '0' and B[i - 1] != '0'));
		// dp[i][1] = min(dp[i][1], dp[i - 1][2] + (B[i] == '0'));


		dp[i][2] = min(dp[i][2], dp[i - 1][0] + 1 + (B[i] == '1'));
		dp[i][2] = min(dp[i][2], dp[i - 1][2] + (B[i] == '1' and B[i - 1] != '1'));
	}

	// print(dp);
	// for (int i = 0; i < N; ++i) printf("%d", dp[i][0]); printf("\n");
	// for (int i = 0; i < N; ++i) printf("%d", dp[i][1]); printf("\n");
	// for (int i = 0; i < N; ++i) printf("%d", dp[i][2]); printf("\n");

	printf("%d\n", min(dp[N - 1][0], min(dp[N - 1][1], dp[N - 1][2])));
}

/* Look for:
* special cases (n=1?)
* overflow (ll vs int?)
* the exact constraints (multiple sets are too slow for n=10^6 :( )
* array bounds
*/

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 248 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Incorrect 5 ms 248 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #2
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 248 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Incorrect 5 ms 248 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 0 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 83 ms 59084 KB Output is correct
8 Correct 81 ms 59084 KB Output is correct
9 Correct 83 ms 59080 KB Output is correct
10 Correct 84 ms 59084 KB Output is correct
11 Correct 82 ms 59084 KB Output is correct
12 Correct 82 ms 59084 KB Output is correct
13 Correct 84 ms 59080 KB Output is correct
14 Correct 81 ms 59084 KB Output is correct

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 248 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Incorrect 5 ms 248 KB Output isn't correct
14 Halted 0 ms 0 KB -