This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> // Общий файл.
#include <ext/pb_ds/tree_policy.hpp> // Содержит класс tree_order_statistics_node_update
using namespace std;
using namespace __gnu_pbds;
typedef tree< pair < long long, int >, null_type, less<pair < long long, int >>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
ordered_set s;
int n, h[41], g[41];
long long k;
vector < pair < int, long long > > v;
vector < pair < int, pair < long long, int > > > v2;
int main(){
cin >> n >> k;
for(int i = 1; i <= n; i++){
cin >> h[i] >> g[i];
}
int q = (n + 1) / 2;
for(int i = 0; i < (1 << q); i++){
long long sum = 0;
bool ok = 1;
int last = 0;
for(int j = 0; j < q; j++){
if((i >> j) & 1){
if(last > h[j + 1]){
ok = 0;
break;
}
last = h[j + 1];
sum += g[j + 1];
}
}
if(ok){
v.push_back({last, sum});
}
}
sort(v.begin(), v.end());
int q2 = n - q;
for(int i = 0; i < (1 << q2); i++){
long long sum = 0;
bool ok = 1;
int last = 0, first = 1e9 + 1;
for(int j = 0; j < q2; j++){
if((i >> j) & 1){
if(first == (int)1e9 + 1){
first = h[j + 1 + q];
}
if(last > h[j + 1 + q]){
ok = 0;
break;
}
last = h[j + 1 + q];
sum += g[j + 1 + q];
}
}
if(ok){
s.insert({sum, i});
v2.push_back({first, {sum, i}});
}
}
sort(v2.begin(), v2.end());
int pos = 0;
long long ans = 0;
for(int i = 0; i < v.size(); i++){
while(pos < (int)v2.size() && v[i].first > v2[pos].first){
s.erase(v2[pos].second);
pos++;
}
ans += ((int)s.size() - (int)s.order_of_key({max(k - v[i].second, 0ll), 0}));
}
cout << ans;
}
Compilation message (stderr)
san.cpp: In function 'int main()':
san.cpp:63:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
63 | for(int i = 0; i < v.size(); i++){
| ~~^~~~~~~~~~
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