Submission #1091536

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091536		LucasLe	Knapsack (NOI18_knapsack)	C++17	100 / 100	61 ms	52052 KiB

knapsack

#include <bits/stdc++.h>


#define                int  long long
#define                pii  pair<int, int>
#define                 fi  first
#define                 se  second
#define                 ld  long double
#define                 vi  vector<int>
#define                vii  vector<vector<int>>
#define             all(v)  (v).begin(), (v).end()
#define       rep(i, a, b)  for (int i = (a), _b = (b); i <= _b; ++i)
#define       per(i, b, a)  for (int i = (b), _a = (a); i >= _a; --i)

using namespace std;

const int MOD = 1e9 + 7;

int add(int a, int b) {
  a += b;
  if (a >= MOD) a -= MOD;
  return a;
}

int mul(int a, int b) {
  (a *= b) %= MOD;
  return a;
}

int ceil(int x, int y) {
  return (x + y - 1) / y;
}

int bin_pow(int x, int y) {
  int res = 1;
  while (y) {
    if (y & 1) res = res * x % MOD;
    x = x * x % MOD;
    y >>= 1;
  }
  return res;
}

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

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

mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());

const int INF = 1e17;
const int maxn = 2e6 + 5;
const int B = 2000;

int s, n;
int f[maxn + 5];
vector<pair<int, int>> g[maxn + 5];

void solve(int tc) {
  cin >> s >> n;
  for (int i = 1; i <= n; ++i) {
    int v, w, k; cin >> v >> w >> k;
    g[w].push_back({v, k});
  }
  for (int i = 1; i <= s; ++i) {
    sort(g[i].begin(), g[i].end());
    int weight = 0;
    for (int j = (int)g[i].size() - 1; j >= 0; --j) {
      int v = g[i][j].first, am = g[i][j].second;
      while (weight + i <= s && am > 0) {
        am--;
        weight += i;
        for (int w = s; w >= i; --w) {
          f[w] = max(f[w], f[w - i] + v);
        }
      }
      if (weight + i > s) break;
    }
  }
  cout << f[s];
}

signed main() {

  ios_base::sync_with_stdio(false);
  cin.tie(0); cout.tie(0);

  int tc = 1;
  //cin >> tc;

  for (int i = 1; i <= tc; ++i) {
    solve(i);
  }
}

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