fork(1) download 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. using ll = long long int;
  4. #define MOD (ll) (1e9+7)
  5.  
  6. ll lazy[1000000];
  7. void buildTree(ll *tree,ll ind,ll s,ll e)
  8. {
  9. 	if(s>e)
  10. 		return;
  11. 	if(s==e)
  12. 	{
  13. 		tree[ind] = 0;
  14. 		return;
  15. 	}
  16.  
  17. 	ll mid = (s+e)/2;
  18. 	buildTree(tree,2*ind,s,mid);
  19. 	buildTree(tree,2*ind+1,mid+1,e);
  20.  
  21. 	tree[ind] = 0;
  22. 	return;
  23.  
  24. }
  25.  
  26.  
  27. ll power(ll a,ll b,ll mod = MOD)
  28. {
  29. 	ll res = 1;
  30. 	while(b)
  31. 	{
  32. 		if(b%2 == 1)
  33. 		{
  34. 			res = (res *a)%mod;
  35. 		}
  36. 		a = (a*a)%mod;
  37. 		b>>=1;
  38. 	}
  39. 	return res;
  40. }
  41.  
  42. void lazy_update(ll *t,ll ss,ll se,ll node)
  43. {
  44. 	if(lazy[node]!=-1)
  45. 	{
  46. 		t[node] = (power(2,(se-ss+1),MOD)-1)*lazy[node];
  47. 		if(ss!=se)
  48. 		{
  49. 			lazy[2*node]=lazy[node];
  50. 			lazy[2*node+1]=lazy[node];
  51. 		}
  52. 		lazy[node] = -1;
  53. 	}
  54.  
  55. }
  56.  
  57. void update_range(ll *t,ll ss,ll se,ll l,ll r,ll val,ll node)
  58. {
  59. 	   lazy_update(t,ss,se,node);
  60. 	   if(ss>r || se<l)
  61. 	   {
  62. 	     return;
  63. 	   }
  64. 	   if(ss>=l && se<=r)
  65. 	   {
  66. 	       	t[node] = (power(2,(se-ss+1),MOD)-1)*val;
  67. 	       	if(ss!=se)
  68.         {
  69.             lazy[node*2]=val;
  70.             lazy[node*2+1]=val;
  71.         }
  72.         return;
  73. 	   }
  74. 	   ll mid=ss+se>>1;
  75.     update_range(t,ss,mid,l,r,val,node*2);
  76.     update_range(t,mid+1,se,l,r,val,node*2+1);
  77.     t[node]=(t[node*2]*power(2,se-mid,MOD)%MOD+t[node*2+1])%MOD;
  78. }
  79.  
  80. ll query(ll *t,ll ss,ll se,ll l,ll r,ll node)
  81. {
  82.     lazy_update(t,ss,se,node);
  83. 	   if(ss>r || se<l)
  84. 	   {
  85. 	     return 0;
  86. 	   }
  87. 	   if(ss>=l && se<=r)
  88. 	   {
  89. 	       return t[node];
  90. 	   }
  91. 	   ll mid= (ss+se)/2;
  92.     ll p1 = query(t,ss,mid,l,r,(2*node));
  93.     ll p2 = query(t,mid+1,se,l,r,(2*node)+1);
  94.     return (p1* power(2,min(se,r)-mid,MOD)%MOD+p2)%MOD;
  95. }
  96.  
  97. int main()
  98. {
  99.    ll n,m;
  100.    cin>>n>>m;
  101.    ll t[4*n+2];
  102.    for(int i=0;i<1000000;i++)
  103.    {
  104.       lazy[i] = -1;
  105.    }
  106.    buildTree(t,1,0,n-1);
  107.    while(m--)
  108.    {
  109.         int x,l,r;
  110.         cin>>x>>l>>r;
  111.         if(x == 0 || x==1 )
  112.         {
  113.             update_range(t,0,n-1,l,r,x,1);
  114.         }
  115.         else
  116.         {
  117.             ll ans=query(t,0,n-1,l,r,1);
  118.             cout<<ans<<endl;
  119.         }
  120.     }
  121. }
Runtime error #stdin #stdout 0.07s 11192KB
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https://ideone.com/tavnEO
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
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