// Om Namah Shivaya
// GM in 126 days
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define endl '\n'
#define pb push_back
#define conts continue
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "YES" << endl
#define no cout << "NO" << endl
#define ff first
#define ss second
#define ceil2(x,y) ((x+y-1) / (y))
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#ifndef ONLINE_JUDGE
#define debug(x) cout << #x <<" = "; print(x); cout << endl
#else
#define debug(x)
#endif
#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)
bool iseven(ll n) {if ((n & 1) == 0) return true; return false;}
void print(ll t) {cout << t;}
void print(int t) {cout << t;}
void print(string t) {cout << t;}
void print(char t) {cout << t;}
void print(double t) {cout << t;}
void print(ld t) {cout << t;}
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(pair <T, V> p) {cout << "{"; print(p.ff); cout << ","; print(p.ss); cout << "}";}
template <class T> void print(vector <T> v) {cout << "[ "; for (T i : v) {print(i); cout << " ";} cout << "]";}
template <class T> void print(set <T> v) {cout << "[ "; for (T i : v) {print(i); cout << " ";} cout << "]";}
template <class T> void print(multiset <T> v) {cout << "[ "; for (T i : v) {print(i); cout << " ";} cout << "]";}
template <class T, class V> void print(map <T, V> v) {cout << "[ "; for (auto i : v) {print(i); cout << " ";} cout << "]";}
template<typename T> void amin(T &a, T b) { a = min(a, b); }
template<typename T> void amax(T &a, T b) { a = max(a, b); }
void usaco(string filename) {
freopen((filename + ".in").c_str(), "r", stdin);
freopen((filename + ".out").c_str(), "w", stdout);
}
const int MOD = 1e9 + 7;
const int maxn = 1e5 + 5;
const int inf1 = 1e9 + 5;
const ll inf2 = ll(1e18) + 5;
template<typename T>
struct fenwick {
int siz;
vector<T> tree;
fenwick(int n) {
siz = n;
tree = vector<T>(n + 1);
}
int lsb(int x) {
return __builtin_ffs(x) - 1;
}
void build(vector<T> &a, int n) {
for (int i = 1; i <= n; ++i) {
int toadd = 1 << lsb(i);
int par = i + toadd;
tree[i] += a[i];
if (par <= siz) {
tree[par] += tree[i];
}
}
}
void pupd(int i, T v) {
while (i <= siz) {
tree[i] += v;
int toadd = 1 << lsb(i);
i += toadd;
}
}
T sum(int i) {
T res = 0;
while (i) {
res += tree[i];
int tosub = 1 << lsb(i);
i -= tosub;
}
return res;
}
T query(int l, int r) {
T res = sum(r) - sum(l - 1);
return res;
}
};
void solve(int test_case)
{
ll n, k; cin >> n >> k;
vector<pll> a(n);
rep(i, n) cin >> a[i].ff >> a[i].ss;
vector<ll> b(n);
rep(i, n) b[i] = a[i].ff;
sort(all(b));
auto it = unique(all(b));
b.resize(it - b.begin());
rep(i, n) a[i].ff = lower_bound(all(b), a[i].ff) - b.begin();
b.clear();
ll group1 = n / 2, group2 = ceil2(n, 2);
vector<vector<ll>> val1(n), val2(n);
rep(mask, 1 << group1) {
ll prev = 0, sum = 0;
bool flag = true;
rep(i, group1) {
ll f = 1ll << i;
if (!(mask & f)) conts;
if (a[i].ff < prev) {
flag = false;
break;
}
prev = a[i].ff;
sum += a[i].ss;
}
if (!flag) conts;
val1[prev].pb(sum);
b.pb(k - sum);
}
rep(mask, 1 << group2) {
ll prev = 0, sum = 0;
bool flag = true;
rep(i, group2) {
ll f = 1ll << i;
if (!(mask & f)) conts;
if (a[i + group1].ff < prev) {
flag = false;
break;
}
prev = a[i + group1].ff;
sum += a[i + group1].ss;
}
if (!flag) conts;
ll first = n - 1;
rep(i, group2) {
ll f = 1 << i;
if (mask & f) {
first = a[i + group1].ff;
break;
}
}
val2[first].pb(sum);
b.pb(sum);
}
sort(all(b));
auto it2 = unique(all(b));
b.resize(it2 - b.begin());
ll siz = sz(b);
fenwick<ll> fenw(siz + 5);
Tree<pll> os;
ll ans = 0;
ll cnt = 0;
rev(i, n - 1, 0) {
trav(x, val2[i]) {
ll val = lower_bound(all(b), x) - b.begin() + 1;
fenw.pupd(val, 1);
}
trav(x, val1[i]) {
ll mn = k - x;
ll val = lower_bound(all(b), mn) - b.begin() + 1;
ans += fenw.query(val, siz);
}
}
cout << ans << endl;
}
int main()
{
fastio;
int t = 1;
// cin >> t;
rep1(i, t) {
solve(i);
}
return 0;
}
Compilation message
san.cpp: In function 'void solve(int)':
san.cpp:210:8: warning: unused variable 'cnt' [-Wunused-variable]
210 | ll cnt = 0;
| ^~~
san.cpp: In function 'void usaco(std::string)':
san.cpp:64:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
64 | freopen((filename + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
san.cpp:65:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
65 | freopen((filename + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
34 ms |
2648 KB |
Output is correct |
| 2 |
Correct |
4 ms |
468 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
57 ms |
4616 KB |
Output is correct |
| 2 |
Correct |
26 ms |
868 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
471 ms |
19012 KB |
Output is correct |
| 2 |
Correct |
108 ms |
3680 KB |
Output is correct |
