Submission #1220160

#	Time	Username	Problem	Language	Result	Execution time	Memory
1220160		orzminhhc	Knapsack (NOI18_knapsack)	C++20	100 / 100	41 ms	3144 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#pragma O3
#define all(x) begin(x), end(x)
#define int long long
#define AC ios_base::sync_with_stdio(0); cin.tie(0);
typedef long long ll;
typedef unsigned long long ull;

ll max(ll a, ll b) { return (a > b) ? a : b; }
ll min(ll a, ll b) { return (a < b) ? a : b; }
ll gcd(ll a, ll b) { return __gcd(abs(a), abs(b)); }
ll lcm(ll a, ll b) { return abs(a) / gcd(a, b) * abs(b); }

ll LASTBIT(ll mask) { return mask & -mask; }
int pop_cnt(ull mask) { return __builtin_popcountll(mask); }
int ctz(ull mask) { return __builtin_ctzll(mask); }
int logOf(ull mask) { return 63 - __builtin_clzll(mask); }

template <class T1, class T2>
bool maximize(T1 &a, T2 b) {
  if (a < b) { a = b; return true; }
  return false;
}

template <class T1, class T2>
bool minimize(T1 &a, T2 b) {
  if (a > b) { a = b; return true; }
  return false;
}

template <class T>
void printArr(const T &container, string sep = " ", string finish = "\n", ostream &out = cout) {
  for (auto &it : container) out << it << sep;
  out << finish;
}

struct item{
    int v,w,k;
};

void solve() {
    int s,n; cin >> s >> n;
    vector<int> dp(s+1,0);
    vector<vector<pair<int,int>>> weight(s+1);
    for(int i = 0; i < n ; i ++){
        int v,w,k; cin >> v >> w >> k;
        weight[w].push_back({v,k});
    }
    vector<pair<int,int>> v;
    for(int i = 1; i <= s; i ++){
      sort(all(weight[i]));
      reverse(all(weight[i]));
      int t = s/i;
      for(auto &it : weight[i]){
        while(it.second > 0 && t > 0){
          v.push_back({i,it.first});
          it.second --;
          t --;
        }
      }
    }
    for(int i = 0; i < v.size(); i ++){
      for(int w = s; w >= 0; w--){
        if(w - v[i].fi >= 0) dp[w] = max(dp[w], dp[w-v[i].fi] + v[i].se);
      }
    }
    cout << *max_element(all(dp)) << '\n';
}

signed main() {
  AC
  int t = 1;
  clock_t start = clock();
  // cin >> t;
  for (int test = 1; test <= t; ++test) {
    solve();
  }
  cerr << "Time: " << clock() - start << "ms **" << endl;
  return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 20 / 20
• Subtask 4: 24 / 24
• Subtask 5: 27 / 27