#include <bits/stdc++.h>
#define N 100001
#define MOD 998244353
#define ll long long
#define pb push_back
const int M=62;
using namespace std;
int a[1025][1025],o=0;
vector<int>v[13][2];
void build(int id,int l,int r,int height){
// cout << l << ' ' << r << '\n';
if(id!=1){
if(id%2==0){
for(int i=l;i<=r;i++){
v[height][0].pb(i);
}
}
else{
for(int i=l;i<=r;i++){
v[height][1].pb(i);
}
}
}
if(l==r) return;
int m=(l+r)>>1;
build(id*2,l,m,height+1);
build(id*2+1,m+1,r,height+1);
}
int encode (int n, int x, int y) {
if(o==0){
build(1,1,1024,0);
for(int i=1;i<=10;i++){
for(int j:v[i][0]){
for(int k:v[i][1]){
a[j][k]=i;
}
}
}
for(int j:v[10][1]){
for(int k:v[10][0]){
a[j][k]=11;
}
}
o++;
}
return a[x][y];
}
int decode (int n, int q, int h) {
if(h!=11){
int k=10-h;
k=pow(2,k);
int d=(q-1)/k;
if(d%2==0){
return 1;
}
else return 0;
}
else{
if(q%2==0){
return 1;
}
else return 0;
}
}
Compilation message
decoder.cpp: In function 'int decode(int, int, int)':
decoder.cpp:4:5: error: 'pow' was not declared in this scope
4 | k=pow(2,k);
| ^~~
