# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|
145683 | | heon | San (COCI17_san) | C++17 | | 309 ms | 21060 KiB |
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 <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <ctime>
#include <cassert>
#include <complex>
#include <string>
#include <cstring>
#include <chrono>
#include <random>
#include <queue>
#include <bitset>
#include <stack>
#include <iomanip>
using namespace std;
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
typedef vector <int> vi;
typedef pair<int,int> ii;
typedef long long ll;
typedef long double ld;
const int mod = 1e9 + 7;
const ll inf = 3e18 + 5;
int add(int a, int b) { return (a += b) < mod ? a : a - mod; }
int mul(int a, int b) { return 1LL * a * b % mod; }
int h[41], g[41];
int n;
vector<pair<int, ll>> v;
vector<pair<ll, int>> u;
void f(int i, ll coins){
for(int j = i + 1; j < n / 2; j++){
if(h[i] <= h[j]){
f(j, coins + g[j]);
}
}
v.emplace_back(h[i], coins);
}
void ff(int i, ll coins, int start){
for(int j = i + 1; j < n; j++){
if(h[i] <= h[j]){
ff(j, coins + g[j], start);
}
}
u.emplace_back(coins, start);
}
int main(){
ios_base::sync_with_stdio(false); cin.tie(0);
ll k;
cin >> n >> k;
for(int i = 0; i < n; i++) cin >> h[i] >> g[i];
for(int i = 0; i < n / 2; i++) f(i, g[i]);
for(int i = n / 2; i < n; i++) ff(i, g[i], i);
h[n] = 1e9 + 5;
v.emplace_back(0, 0);
u.emplace_back(0, n);
sort(all(v));
sort(all(u));
ll res = 0;
map<int, vector <ll>> ump;
for(auto [coins, start] : u){
ump[start].push_back(coins);
}
for(auto [endh, coins] : v){
for(int i = n / 2; i <= n; i++){
if(h[i] >= endh){
res += ump[i].end() - lower_bound(all(ump[i]), k - coins);
}
}
}
cout << res;
}
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