oj.uz

Submission #251939

# Submission time Handle Problem Language Result Execution time Memory
251939 2020-07-23T07:48:27 Z nnnnnnnnnnnnnnnn Lamps (JOI19_lamps) C++14
4 / 100
 129 ms 20076 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef vector<int> vi;
typedef pair<int,int> ii;
typedef pair<ll,int> pli;
typedef pair<int,ll> pil;
typedef pair<ll,ll> pll;
const int N = 1e6,inf = 1e8;
int n;
string a,b;
int dp[4][N];	
// ->0
// ->1
// flip
int solve()
{
	int i,j,k;
	for(i=0;i<4;i++)
	{
		for(j=0;j<n;j++)
		{
			dp[i][j] = inf;
		}
	}
	if(a[0]==b[0])
	{
		if(a[0]=='0')	dp[0][0] = 1;
		else			dp[1][0] = 1;
		dp[3][0] = 0;
	}
	else
	{
		dp[2][0] = 1;
		if(b[0]=='0')	dp[0][0] = 1;
		else			dp[1][0] = 1;
	}
	for(i=1;i<n;i++)
	{
		for(j=0;j<4;j++)
		{
			for(k=0;k<4;k++)
			{
				dp[j][i] = min(dp[j][i],dp[k][i-1]+1);
			}
		}
		if(a[i]==b[i])
		{
			for(j=0;j<4;j++)
			{
				dp[3][i] = min(dp[3][i],dp[j][i-1]);
			}
			if(a[i]=='0')
			{
				dp[0][i] = min(dp[0][i],dp[0][i-1]);
	//			dp[3][i] = min(dp[3][i],dp[3][i-1]);
			}
			else
			{
				dp[1][i] = min(dp[1][i],dp[1][i-1]);
	//			dp[3][i] = min(dp[3][i],dp[3][i-1]);
			}
		}
		else
		{
			if(a[i]=='0')
			{
				dp[2][i] = min(dp[2][i],dp[2][i-1]);
				dp[1][i] = min(dp[1][i],dp[1][i-1]);
			}
			else
			{
				dp[2][i] = min(dp[2][i],dp[2][i-1]);
				dp[0][i] = min(dp[0][i],dp[0][i-1]);
			}
		}
	}
/*	for(i=0;i<4;i++)
	{
		for(j=0;j<n;j++)
		{
			if(dp[i][j]==inf)	printf("! ");
			else
			printf("%d ",dp[i][j]);
		}
		printf("\n");
	}			*/
	int ans = min(min(dp[0][n-1],dp[1][n-1]),min(dp[2][n-1],dp[3][n-1]));
	return ans;
}
int main()
{
	scanf("%d",&n);
	cin >> a >> b;
	int res = solve();
	printf("%d",res);
}

Compilation message

lamp.cpp: In function 'int main()':
lamp.cpp:93:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 0 ms 384 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 0 ms 384 KB Output is correct
13 Incorrect 1 ms 384 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #2
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 0 ms 384 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 0 ms 384 KB Output is correct
13 Incorrect 1 ms 384 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 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 376 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 128 ms 20072 KB Output is correct
8 Correct 127 ms 20076 KB Output is correct
9 Correct 129 ms 20072 KB Output is correct
10 Correct 125 ms 20072 KB Output is correct
11 Correct 127 ms 20072 KB Output is correct
12 Correct 126 ms 20072 KB Output is correct
13 Correct 127 ms 20072 KB Output is correct
14 Correct 126 ms 20000 KB Output is correct

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 0 ms 384 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 0 ms 384 KB Output is correct
13 Incorrect 1 ms 384 KB Output isn't correct
14 Halted 0 ms 0 KB -