莫队加树状数组
1 #include<cstdio> 2 #include<iostream> 3 #include<cstring> 4 #include<cstdlib> 5 #include<cmath> 6 #include<queue> 7 #include<algorithm> 8 #include<vector> 9 #define M 2000009 10 #define EPS 1e-10 11 #define MO 10000 12 #define ll long long 13 using namespace std; 14 ll read() 15 { 16 char ch=getchar(); 17 ll x=0,f=1; 18 for(;ch<'0'||ch>'9';ch=getchar()) 19 if(ch=='-') 20 f=-1; 21 for(;ch>='0'&&ch<='9';ch=getchar()) 22 x=x*10+ch-'0'; 23 return x*f; 24 } 25 int belong[M],n,a[M],q,m,h[M],ans[M]; 26 int shu[M],shu1[M]; 27 struct data 28 { 29 int x,y,id; 30 }b[M]; 31 bool cmp(data a1,data a2) 32 { 33 if(belong[a1.x]==belong[a2.x]) 34 return a1.y<a2.y; 35 return belong[a1.x]<belong[a2.x]; 36 } 37 int xun(int x) 38 { 39 int sum=0; 40 for(;x;x-=x&-x) 41 sum+=shu[x]; 42 return sum; 43 } 44 int xun1(int x) 45 { 46 int sum=0; 47 for(;x;x-=x&-x) 48 sum+=shu1[x]; 49 return sum; 50 } 51 void jia(int x) 52 { 53 for(;x<h[0];x+=x&-x) 54 shu[x]++; 55 } 56 void jia1(int x) 57 { 58 for(;x<h[0];x+=x&-x) 59 shu1[x]++; 60 } 61 void jian(int x) 62 { 63 for(;x<h[0];x+=x&-x) 64 shu[x]--; 65 } 66 void jian1(int x) 67 { 68 for(;x<h[0];x+=x&-x) 69 shu1[x]--; 70 } 71 int main() 72 { 73 n=read(); 74 for(int i=1;i<=n;i++) 75 h[i]=a[i]=read(); 76 sort(h+1,h+n+1); 77 h[0]=unique(h+1,h+n+1)-h; 78 for(int i=1;i<=n;i++) 79 a[i]=lower_bound(h+1,h+h[0],a[i])-h; 80 q=read(); 81 for(int i=1;i<=q;i++) 82 { 83 b[i].x=read(); 84 b[i].y=read(); 85 b[i].id=i; 86 } 87 m=sqrt(n); 88 for(int i=1;i<=q;i++) 89 belong[i]=i/m+1; 90 sort(b+1,b+q+1,cmp); 91 int l=0,r=0,sum=0; 92 for(int i=1;i<=q;i++) 93 { 94 for(;r<b[i].y;r++) 95 { 96 sum+=xun1(h[0]-a[r+1]); 97 jia1(h[0]-a[r+1]); 98 jia(a[r+1]); 99 } 100 for(;r>b[i].y;r--) 101 { 102 jian1(h[0]-a[r]); 103 jian(a[r]); 104 sum-=xun1(h[0]-a[r]); 105 } 106 for(;l<b[i].x;l++) 107 { 108 if(!l) 109 continue; 110 jian(a[l]); 111 jian1(h[0]-a[l]); 112 sum-=xun(a[l]); 113 } 114 for(;l>b[i].x;l--) 115 { 116 sum+=xun(a[l-1]); 117 jia(a[l-1]); 118 jia1(h[0]-a[l-1]); 119 } 120 ans[b[i].id]=sum; 121 } 122 for(int i=1;i<=q;i++) 123 printf("%d ",ans[i]); 124 } 125