Submission #145679

#	Time	Username	Problem	Language	Result	Execution time	Memory
145679		heon	San (COCI17_san)	C++17	0 / 120	4 ms	504 KiB

san

#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);
	#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
	#endif

  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;
  unordered_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;
}

Compilation message (stderr)

san.cpp: In function 'int main()':
san.cpp:61:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("input.txt", "r", stdin);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
san.cpp:62:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("output.txt", "w", stdout);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 24
• Subtask 2: 0 / 24
• Subtask 3: 0 / 24
• Subtask 4: 0 / 24
• Subtask 5: 0 / 24