#include<bits/stdc++.h>
#include <bubblesort2.h>
using namespace std;
const int N = 5e5;
vector <int> a;
vector <int> v2;
vector <int> x;
class fenwick{
int fen[N];
int n;
public:
void init(int sz){
n = sz;
for(int i = 0;i < n;i++)fen[i] = 0;
}
void add(int pos){
for(int i = pos;i < n;i|=(i + 1)){
fen[i]++;
}
}
int get(int pos){
int r = 0;
for(int i = pos;i >= 0;i&=(i + 1),i--){
r+=fen[i];
}
return r;
}
};
int fen2[N][M];
int n,q;
void add(int x,int y,int nr){
//cout<<"add:"<<x<<' '<<y<<' '<<nr<<'\n';
for(int i = x;i < n;i|=(i + 1)){
for(int j = y;j >= 0;j&=(j + 1),j--){
fen2[i][j]+=nr;
}
}
}
int get(int x,int y){
//cout<<"get:"<<x<<' '<<y<<' ';
int r = 0;
for(int i = x;i >= 0;i&=(i + 1),i--){
for(int j = y;j < M;j|=(j + 1)){
r+=fen2[i][j];
}
}
//cout<<r<<'\n';
return r;
}
set <int> last[M];
int p[N];
fenwick fen;
int cnt = 0;
vector <int> countScans(vector <int> v,vector <int> q1,vector <int> q2){
n = v.size();
q = q1.size();
bool ok = 0;
for(int i = 0;i < q;i++){
q2[i]--;
}
for(int i = 0;i < n;i++){
v[i]--;
if(v[i] >= 100)ok = 1;
if(v[i] < 100)last[v[i]].insert(i);
}
vector<int>ans;
for(int i = 0;i < q;i++){
v[q1[i]] = q2[i];
fen.init(n);
int ans2 = 0;
for(int j = 0;j < n;j++)p[j] = j;
sort(p,p + n,[&](int a,int b){
if(v[a] == v[b])return a > b;
return v[a] > v[b];
});
for(int i = 0;i < n;i++){
ans2 = max(ans2,fen.get(p[i]));
fen.add(p[i]);
}
ans.push_back(ans2);
//cout<<ans2<<' ';
}
return ans;
}
/*int main(){
int n,q;
cin>>n>>q;
for(int i = 0;i < n;i++){
int b;
cin>>b;
a.push_back(b);
}
for(int i= 0;i < q;i++){
int b,c;
cin>>b>>c;
v2.push_back(c);
x.push_back(b);
}
countScans(a,x,v2);
return 0;
}*/
/**
4 2
1 2 3 4
0 3
2 1
**/
Compilation message
bubblesort2.cpp:29:13: error: 'M' was not declared in this scope
29 | int fen2[N][M];
| ^
bubblesort2.cpp: In function 'void add(int, int, int)':
bubblesort2.cpp:35:13: error: 'fen2' was not declared in this scope
35 | fen2[i][j]+=nr;
| ^~~~
bubblesort2.cpp: In function 'int get(int, int)':
bubblesort2.cpp:43:27: error: 'M' was not declared in this scope
43 | for(int j = y;j < M;j|=(j + 1)){
| ^
bubblesort2.cpp:44:16: error: 'fen2' was not declared in this scope
44 | r+=fen2[i][j];
| ^~~~
bubblesort2.cpp: At global scope:
bubblesort2.cpp:50:16: error: 'M' was not declared in this scope
50 | set <int> last[M];
| ^
bubblesort2.cpp: In function 'std::vector<int> countScans(std::vector<int>, std::vector<int>, std::vector<int>)':
bubblesort2.cpp:64:23: error: 'last' was not declared in this scope
64 | if(v[i] < 100)last[v[i]].insert(i);
| ^~~~
