Submission #794344

#	Time	Username	Problem	Language	Result	Execution time	Memory
794344		theghostking	Knapsack (NOI18_knapsack)	C++14	49 / 100	33 ms	32352 KiB

knapsack

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

int dp[2005][2005];
int search(int i, int remW, vector<pair<int,int>>& kp, int total){
    if (i == total) return 0;
    if (remW == 0) return 0;
    if (dp[i][remW] != -1) return dp[i][remW];
    if (kp[i].first <= remW){
        return dp[i][remW] = max(search(i+1,remW,kp,total),search(i+1,remW-kp[i].first,kp,total)+kp[i].second);
    }
    else{
        return dp[i][remW] = search(i+1,remW,kp,total);
    }
}
     
signed main() {
    memset(dp,-1,sizeof(dp));
    int s,n;
    cin >> s >> n;
    vector<pair<int,int>> arr[2000];//offset weight by one for now
    for (int i = 0; i<n; i++){
        int v,w,k;
        cin >> v >> w >> k;
        w--;
        arr[w].push_back({v,k}); //value quantity
        //k = min(2000,k);
        //w--;
        //int sz1 = arr[w].size();
        //int left = min(2000-sz1,k);
        //for (int j = 0; j<left; j++){
        //    arr[w].push_back(v);
        //}
    }
    int total = 0;
    vector<pair<int,int>> kp;
    for (int i = 0; i<2000; i++){
        sort(arr[i].begin(),arr[i].end());
        reverse(arr[i].begin(),arr[i].end());
        int lft = 2000;
        int sz = arr[i].size();
        int pt = 0;
        while (lft > 0 && pt != sz){
            int dec = min(lft,arr[i][pt].second);
            lft -= dec;
            for (int j = 0; j<dec; j++){
                int val = arr[i][pt].first;
                kp.push_back({i+1,val});
            }
            pt++;
        }
        total += 2000-lft;
        //for (int j = 0; j<min(2000,sz); j++){
        //    kp.push_back({i+1,arr[i][j]}); //weight,value
        //}
    }
    cout << search(0,s,kp,total) << '\n';
    return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 20 / 20
• Subtask 4: 0 / 24
• Subtask 5: 0 / 27