#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int INF=1e9;
const ll LINF=1e18;
#define fi first
#define se second
#define pii pair<int,int>
#define mid ((l+r)/2)
#define sz(a) (int((a).size()))
#define all(a) a.begin(),a.end()
#define endl "\n"
#define PRINT(x) cerr<<#x<<'='<<x<<endl;
#define pb push_back
#define PRINTvec(niz) { cerr<<#niz<<"="; for(auto _i:niz) cerr<<_i<<" "; cerr<<endl; }
void Solve(){
int N,S; cin>>N>>S;
vector<int> a(N+1); for(int i=1;i<=N;i++) cin>>a[i];
function<void(int,int)> Oper=[&](int i,int j){
cout<<i<<" "<<j<<endl;
a[i]=a[i]^a[j];
};
set<int> s;
function<bool(int,int)> Has=[&](int x,int bit){
return (x&(1<<bit))>0;
};
function<void(int,int,int)> Update=[&](int i,int j,int bit){
if(!Has(a[i],bit) && s.count(i)) s.erase(i);
if(!Has(a[j],bit) && s.count(j)) s.erase(j);
if(Has(a[i],bit)) s.insert(i);
if(Has(a[j],bit)) s.insert(j);
};
int L=1,R=N;
if(S==2){
for(int bit=20;bit>=0;bit--){
s.clear();
for(int i=L;i<=R;i++){
if(Has(a[i],bit)){
s.insert(i);
}
}
while(!s.empty() && !(sz(s)==1 && s.count(L))){
int i=*(prev(s.end()));
if(Has(a[i-1],bit)){
Oper(i,i-1); Update(i-1,i,bit);
}
else{
Oper(i-1,i); Update(i-1,i,bit);
Oper(i,i-1); Update(i-1,i,bit);
}
}
++L;
}
}
else{
for(int bit=3;bit>=0;bit--){
s.clear();
for(int i=L;i<=R;i++){
if(Has(a[i],bit)){
s.insert(i);
}
}
while(!s.empty() && !(sz(s)==1 && s.count(R))){
int i=*(s.begin());
if(Has(a[i+1],bit)){
Oper(i,i+1); Update(i,i+1,bit);
}
else{
Oper(i+1,i); Update(i,i+1,bit);
Oper(i,i+1); Update(i,i+1,bit);
}
}
--R;
}
}
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int t;
//cin>>t;
t=1;
while(t--){
Solve();
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
212 KB |
Not adjacent |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
212 KB |
Not adjacent |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
212 KB |
Not adjacent |
2 |
Halted |
0 ms |
0 KB |
- |