Submission #975653

#	Time	Username	Problem	Language	Result	Execution time	Memory
975653		vjudge1	Knapsack (NOI18_knapsack)	C++17	100 / 100	524 ms	161876 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define AC ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fs first
#define sc second
#define pb push_back
const int inf=INT_MAX;

vector<pii> a[2007];
vector<pii> item;
int dp[20007][2007];
int C, n;

int knapsack(int i, int C){
	if(C < 0)return -inf;
	if(i==item.size())return 0;
	if(dp[i][C] != -1)return dp[i][C];
	
	
	int w = item[i].sc, v= item[i].fs;
	return dp[i][C]= max(knapsack(i+1, C), knapsack(i+1, C-w)+v);
}
int main() {   
    AC
    cin >> C >> n;
    for(int i=0; i<n; i++){
    	int v, w, k;
    	cin >> v >> w >> k;
    	a[w].pb({v,k});
    }
    for(int w=1; w<=2000; w++){
    	sort(a[w].begin(), a[w].end());
    	int used = ceil(C/w);
    	while(used and !a[w].empty()){
    		auto &[v, k] = a[w].back();
    		item.pb({a[w].back().fs, w});
    		used--, k--;
    		if(k==0)a[w].pop_back();
    	}
    }
    memset(dp, -1, sizeof(dp));
    cout << knapsack(0, C);
}

Compilation message (stderr)

knapsack.cpp: In function 'int knapsack(int, int)':
knapsack.cpp:20:6: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |  if(i==item.size())return 0;
      |     ~^~~~~~~~~~~~~

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