Submission #886380

#	Time	Username	Problem	Language	Result	Execution time	Memory
886380		Zero_OP	Knapsack (NOI18_knapsack)	C++14	100 / 100	220 ms	3920 KiB

knapsack

#include<bits/stdc++.h>

using namespace std;

#define range(v) begin(v), end(v)
#define compact(v) v.erase(unique(range(v)), end(v))

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;
}

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

int S, n;

void Zero_OP(){
  cin >> S >> n;

  vector<pair<ll, int>> items;
  vector<vector<pair<int, int>>> block(S + 1);
  while(n--){
    int v, w, k;
    cin >> v >> w >> k;

    block[w].push_back({v, k});
  }

  vector<ll> dp(S + 1, -1e18);
  dp[0] = 0;
  for(int i = 1; i <= S; ++i){
    if(block[i].empty()) continue;
    sort(range(block[i]), greater<pair<int, int>>());
    for(int w = S; w >= 0; --w){
      int curW = 0, curV = 0;
      for(int j = 0; j < block[i].size(); ++j){
        for(int k = 1; k <= block[i][j].second and curW <= S; ++k){
          curW += i;
          curV += block[i][j].first;
          if(w >= curW){
            maximize(dp[w], dp[w - curW] + curV);
          }
        }
      }
    }
  }

  cout << *max_element(range(dp));
}

int main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  #define task "antuvu"
  if(fopen(task".inp", "r")){
    freopen(task".inp", "r", stdin);
    freopen(task".out", "w", stdout);
  }

  Zero_OP();

  return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void Zero_OP()':
knapsack.cpp:43:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |       for(int j = 0; j < block[i].size(); ++j){
      |                      ~~^~~~~~~~~~~~~~~~~
knapsack.cpp: In function 'int main()':
knapsack.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(task".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.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(task".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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