#include<bits/stdc++.h>
#define int long long
using namespace std;
main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n, sz, ans = 0;
long long k;
cin >> n >> k;
int h[n], g[n];
vector < int > e;
for(int i = 0; i < n; i++){
cin >> h[i] >> g[i];
e.push_back(h[i]);
}
sort(e.begin(), e.end());
e.resize(unique(e.begin(), e.end()) - e.begin());
int esz = (int)e.size();
for(int i = 0; i < n; i++){
h[i] = lower_bound(e.begin(), e.end(), h[i]) - e.begin();
}
vector < pair < int, int > > a;
for(int i = 0; i < n / 2; i++){
a.push_back(make_pair(h[i], g[i]));
}
sz = (int)a.size();
vector < long long > s[esz];
for(int i = 1; i < (1 << sz); i++){
long long sum = 0;
bool p = true;
int cur = -1;
for(int j = 0; j < sz; j++){
if((i >> j) & 1){
if(cur > a[j].first){
p = false;
break;
}
cur = a[j].first;
sum += a[j].second;
}
}
if(!p){
continue;
}
if(sum >= k){
ans += 1;
}
s[cur].push_back(sum);
}
for(int i = 0; i < esz; i++){
sort(s[i].begin(), s[i].end());
}
a.clear();
for(int i = n / 2; i < n; i++){
a.push_back(make_pair(h[i], g[i]));
}
sz = (int)a.size();
for(int i = 1; i < (1 << sz); i++){
long long sum = 0;
bool p = true;
int cur = -1, kek = -1;
for(int j = 0; j < sz; j++){
if((i >> j) & 1){
if(cur > a[j].first){
p = false;
break;
}
if(cur == -1){
kek = a[j].first;
}
cur = a[j].first;
sum += a[j].second;
}
}
if(!p){
continue;
}
if(sum >= k){
ans += 1;
}
for(int j = 0; j <= kek; j++){
ans += s[j].end() - lower_bound(s[j].begin(), s[j].end(), k - sum);
}
}
cout << ans;
}
Compilation message
san.cpp:8:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main(){
^
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
384 KB |
Output is correct |
2 |
Correct |
2 ms |
256 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
384 KB |
Output is correct |
2 |
Correct |
3 ms |
384 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
18 ms |
768 KB |
Output is correct |
2 |
Correct |
4 ms |
384 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
40 ms |
1056 KB |
Output is correct |
2 |
Correct |
19 ms |
512 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
223 ms |
3032 KB |
Output is correct |
2 |
Correct |
103 ms |
1716 KB |
Output is correct |