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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. #define pb push_back
  4. #define mp make_pair
  5. #define fi first
  6. #define se second
  7. using namespace std;
  8. typedef pair<int,int> pii;
  9. typedef vector<int> vi;
  10.  
  11. struct node
  12. {
  13. 	int maxf;
  14. 	int lfeq;
  15. 	int rfeq;
  16. };
  17.  
  18. const int MAX=(int)1e5+5;
  19. vi v(MAX);
  20. vector< node > segtree(4*MAX);
  21.  
  22. void build(int low,int high, int pos)
  23. {
  24. 	/*if(low > high)
  25. 		return;*/
  26. 	if(low == high)
  27. 	{
  28. 		segtree[pos].maxf=1;
  29. 		segtree[pos].lfeq=1;
  30. 		segtree[pos].rfeq=1;
  31. 		return;
  32. 	}
  33. 	int mid=(low+high)/2;
  34. 	build(low,mid,pos*2+1);
  35. 	build(mid+1, high, pos*2+2);
  36.  
  37. 	segtree[pos].lfeq=segtree[2*pos+1].lfeq;
  38. 	segtree[pos].rfeq = segtree[2*pos+2].rfeq;
  39. 	segtree[pos].maxf = max(segtree[pos*2+1].maxf, segtree[pos*2+2].maxf);
  40. 	if(v[mid]==v[mid+1])
  41. 	{
  42. 		segtree[pos].maxf = max(segtree[pos].maxf, segtree[pos*2+1].rfeq+segtree[pos*2+2].lfeq);
  43. 		if(v[mid+1] == v[high])
  44. 			segtree[pos].rfeq += segtree[2*pos+1].rfeq;
  45. 		if(v[mid] == v[low])
  46. 			segtree[pos].lfeq += segtree[2*pos+2].lfeq;
  47. 	}
  48.  
  49. 	return;
  50. }
  51.  
  52. node query(int low, int high, int qst, int qen, int pos)
  53. {
  54. 	if(qen<low || qst>high)		//no overlap
  55. 	{
  56. 		node n;
  57. 		n.maxf=n.lfeq=n.rfeq=0;
  58. 		return n;
  59. 	}
  60. 	if(qst <= low && qen>=high)		//total overlap
  61. 		return segtree[pos];
  62.  
  63. 	int mid=(low+high)/2;
  64. 	node a = query(low,mid,qst,qen,2*pos+1);
  65. 	node b = query(mid+1, high, qst, qen, 2*pos+2);
  66. 	node temp;
  67. 	temp.lfeq = a.lfeq;
  68. 	temp.rfeq = b.rfeq;
  69. 	temp.maxf = max(a.maxf,b.maxf);
  70. 	if(v[mid] == v[mid+1])
  71. 	{
  72. 		temp.maxf = max(temp.maxf,a.rfeq+b.lfeq);
  73. 		if(v[mid+1] == v[high])
  74. 			temp.rfeq += a.rfeq;
  75. 		if(v[mid] == v[low])
  76. 			temp.lfeq += b.lfeq;
  77. 	}
  78. 	return temp;
  79.  
  80. }
  81.  
  82. int main()
  83. {
  84. 	ios::sync_with_stdio(false);
  85. 	cin.tie(NULL);
  86. 	int l,r,n,q;
  87. 	while(1)
  88. 	{
  89. 		cin >> n;
  90. 		if(!n)
  91. 			break;
  92. 		cin >> q;
  93. 		for(int i=0;i<n;++i)
  94. 			cin >> v[i];
  95. 		build(0,n-1,0);
  96.  
  97. 		while(q--)
  98. 		{
  99. 			cin >> l >> r;
  100.  
  101. 			node te = query(0,n-1,l-1,r-1,0);
  102. 			cout << te.maxf << '\n';
  103. 		}
  104. 	}
  105. }
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https://ideone.com/L5cTgo
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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