This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#define fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#include <bits/stdc++.h>
using namespace std;
#define sqr 340
#define mid (l+r)/2
#define pb push_back
#define ppb pop_back
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define ins insert
#define era erase
#define C continue
#define mem(dp,i) memset(dp,i,sizeof(dp))
#define mset multiset
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pi;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pi> vpi;
typedef vector<pll> vpll;
const ll mod=1000000007;
const ll mod2=998244353;
const ll inf=1e18*4;
const ld pai=acos(-1);
ll n,k;
ll h[49],g[49],id[49];
vpll v[2];
vll hights[29];
void bt1(ll id,ll gold,ll last){
if(id==n/2){
v[0].pb({last,gold});
return;
}
bt1(id+1,gold,last);
if(h[id]>=last)bt1(id+1,gold+g[id],h[id]);
}
void bt2(ll id,ll gold,ll last,ll fi){
if(id==n){
v[1].pb({fi,gold});
return;
}
bt2(id+1,gold,last,fi);
if(h[id]>=last){
ll xxx=fi;
if(fi==inf)xxx=h[id];
bt2(id+1,gold+g[id],h[id],xxx);
}
}
int main(){
fast;
cin>>n>>k;
for(int i=0;i<n;i++)cin>>h[i]>>g[i];
bt1(0,0,0);
bt2(n/2,0,0,inf);
for(int i=0;i<2;i++)sort(v[i].begin(),v[i].end());
ll xxx=0;
for(int i=0;i<v[1].size();i++){
ll j=i;
while(v[1][i].fi==v[1][j].fi && j<v[1].size())hights[xxx].pb(v[1][j++].se);
sort(hights[xxx].begin(),hights[xxx].end());
id[xxx]=v[1][i].fi;
xxx++;
i=j-1;
}
ll ans=0;
for(auto u:v[0]){
for(int i=0;i<xxx;i++){
if(id[i]<u.fi)C;
ll x=lower_bound(hights[i].begin(),hights[i].end(),k-u.se)-hights[i].begin();
ans+=hights[i].size()-x;
}
}
cout<<ans<<endl;
}
Compilation message (stderr)
san.cpp: In function 'int main()':
san.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<v[1].size();i++){
~^~~~~~~~~~~~
san.cpp:63:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(v[1][i].fi==v[1][j].fi && j<v[1].size())hights[xxx].pb(v[1][j++].se);
~^~~~~~~~~~~~
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