Submission #1095361

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095361		ihne	Knapsack (NOI18_knapsack)	C++17	100 / 100	44 ms	3744 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int mn=2000+5;
struct ITEM{
  int v,w,k;
  ITEM () {}
  ITEM(int _v,int _w,int _k):v(_v),w(_w),k(_k){}
  bool operator < (const ITEM& o) const {
    return v<o.v;
  }
} item[100005];
int dp[mn];
vector<int> v[mn];
signed main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int s,n;
  cin>>s>>n;
  for (int i=1;i<=n;i++){
    cin>>item[i].v>>item[i].w>>item[i].k;
  }
  sort(item+1,item+n+1);
  for (int i=n;i>=1;i--){
    while (item[i].k&&v[item[i].w].size()<s/item[i].w){
      item[i].k--;
      v[item[i].w].pb(item[i].v);
    }
  }
  for (int i=1;i<=s;i++){
    if (v[i].empty()) continue;
    for (int j=0;j<v[i].size();j++){
      for (int k=s;k>=i;k--){
        dp[k]=max(dp[k],dp[k-i]+v[i][j]);
      }
    }
  }
  cout<<dp[s];
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:25:42: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   25 |     while (item[i].k&&v[item[i].w].size()<s/item[i].w){
      |                       ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
knapsack.cpp:32:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for (int j=0;j<v[i].size();j++){
      |                  ~^~~~~~~~~~~~

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