Submission #132600

#	Time	Username	Problem	Language	Result	Execution time	Memory
132600		anayk	Dojave (COCI17_dojave)	C++14	140 / 140	343 ms	29304 KiB

dojave

    #include <iostream>
     
    #define MAXN 2000000
     
    int m, n;
    int first[MAXN];
    int other[MAXN];
    int seq[MAXN];
    long long dp[2][MAXN];
    int min, max;
    int a, b;
     
    void add(int x)
    {
    	min = std::min(x, min);
    	max = std::max(x, max);
    }
     
    void solve(int l, int r)
    {
    	int m = (l+r)/2;
     
    	a = m;
    	b = m+1;
     
    	min = a;
    	max = b;
     
    	add(other[seq[a]]);
    	add(other[seq[b]]);
     
    	while(true)
    	{
    		if(a > min)
    		{
    			if(a == l)
    				break;
     
    			a--;
    			add(other[seq[a]]);
    		}
    		else if(b < max)
    		{
    			if(b == r)
    				break;
     
    			b++;
    			add(other[seq[b]]);
    		}
    		else
    		{
    			first[a] = std::min(first[a], b);
     
    			if(a == l)
    				break;
     
    			a--;
    			add(other[seq[a]]);
    		}
    	}
    }
     
    int main()
    {
    	scanf("%d", &m);
    	n = (1 << m);
     
    	if(m == 1)
    	{
    		printf("%d", 2);
    		return 0;
    	}
     
    	for(int i = 0; i < n; i++)
    	{
    		scanf("%d", seq + i);
    		first[i] = MAXN;
    		other[seq[i]^(n-1)] = i;
    	}
     
    	int c = 2;
    	while(c <= n)
    	{
    		for(int i = 0; i < n; i+=c)
    			solve(i, i+c-1);
    		c *= 2;
    	}
     
    	long long answer = n;
    	answer *= (answer-1);
    	answer /= 2;
    	answer += (long long) n;
     
    	dp[0][n] = dp[1][n] = 0;
     
    	for(int i = n-1; i >= 0; i--)
    	{
    		dp[0][i] = dp[1][i] = 0;
    		
    		if(first[i] == MAXN)
    			continue;
     
    		int c = first[i]-i+1;
    		if(c%4)
    		{
    			dp[1][i] = 1;
    			dp[1][i] += dp[0][first[i]+1];
    			dp[0][i] += dp[1][first[i]+1];
    		}
    		else
    		{
    			dp[0][i] = 1;
    			dp[1][i] += dp[1][first[i]+1];
    			dp[0][i] += dp[0][first[i]+1];
    		}
     
    		answer -= dp[0][i];
    	}
     
    	printf("%lld", answer);
     
    	return 0;
    }

Compilation message (stderr)

dojave.cpp: In function 'int main()':
dojave.cpp:65:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
      scanf("%d", &m);
      ~~~~~^~~~~~~~~~
dojave.cpp:76:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", seq + i);
       ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 14 / 14
• Subtask 9: 14 / 14
• Subtask 10: 14 / 14