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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int long long
  4. #define ii pair<int,int>
  5. #define iii pair<int, ii>
  6. #define fi first
  7. #define se second
  8. #define inf 10000000000000000
  9. const int N = 2005;
  10. int n, h[N], l[N], d, b[N], vis[N];
  11. int ans = 0;
  12. void bt(int pos, int n) {
  13.     if(pos > n) {
  14.         int sum = 0, cnt = 0;
  15.         for(int j = 1; j <= n; j++) {
  16.             int vt = b[j];
  17.             sum += h[vt];
  18.         }
  19.         for(int i = n; i >= 1; i--) {
  20.             int vt = b[i];
  21.             if(sum + l[vt] >= d) {
  22.                 cnt++;
  23.                 sum -= h[vt];
  24.             }
  25.         }
  26.         ans = max(ans,cnt);
  27.         return;
  28.     }
  29.     for(int j = 1; j <= n; j++) {
  30.         if(vis[j] == 0) {
  31.             b[pos] = j;
  32.             vis[j] = 1;
  33.             bt(pos+1,n);
  34.             vis[j] = 0;
  35.         }
  36.     }
  37. }
  38. signed main() {
  39.     ios_base::sync_with_stdio(0);
  40.     cin.tie(0);
  41.     cout.tie(0);
  42.  
  43.         freopen("code.inp", "r", stdin);
  44.         freopen("code.ans", "w", stdout);
  45.  
  46.     cin >> n;
  47.     for(int i = 1; i <= n; i++) cin >> h[i] >> l[i];
  48.     cin >> d;
  49.     bt(1,n);
  50.     cout << ans;
  51.     return 0;
  52. }
  53.  
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/QzkTA0
language:
C++14 (gcc 8.3)
created:
12 hours ago
visibility:
public

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