#include<bits/stdc++.h>
using namespace std;
long long n,k;
vector<pair<long long,long long>> arr(42);
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin>>n>>k;
for(int i = 0;i<n;i++){
long long a,b;cin>>a>>b;
arr[i] = {a,b};
}
arr[40]={0,0};
long long ans = 0;
if(n<=20){
for(long long mask=0;mask<(1<<n);mask++){
long long s=0,p=40;
for(long long i=0;i<n;i++){
if((1<<i)&mask){
if(arr[i].first>=arr[p].first){
s+=arr[i].second;
}
else{
s=-1;
break;
}
p=i;
}
}
if(s>=k)ans++;
}
}else{
vector<long long> v;
for(long long mask=0;mask<(1<<20);mask++){
long long s=0,p=40;
for(long long i=0;i<20;i++){
if((1<<i)&mask){
if(arr[i].first>=arr[p].first){
s+=arr[i].second;
}
else{
s=-1;
break;
}
p=i;
}
}
v.push_back(s);
}
n-=20;
vector<pair<long long,long long>> cd;
for(int i = 20;i<n;i++){
cd.push_back({arr[i].first,arr[i].second});
}
for(long long mask=0;mask<(1<<n);mask++){
long long s=0,p=40;
for(long long i=0;i<n;i++){
if((1<<i)&mask){
if(cd[i].first>=cd[p].first){
s+=cd[i].second;
}
else{
s=-1;
break;
}
p=i;
}
}
int y = lower_bound(v.begin(),v.end(),k-s)-v.begin();
if(y>0&&v[y-1]==k-s)y--;
ans+=(v.size()-1)-y;
}
}
cout<<ans;
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
204 KB |
Output is correct |
2 |
Correct |
1 ms |
204 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
63 ms |
204 KB |
Output is correct |
2 |
Correct |
16 ms |
308 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
94 ms |
17332 KB |
Execution killed with signal 11 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
61 ms |
17428 KB |
Execution killed with signal 11 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
95 ms |
17348 KB |
Execution killed with signal 11 |
2 |
Halted |
0 ms |
0 KB |
- |