Submission #908571

#	Time	Username	Problem	Language	Result	Execution time	Memory
908571		Ronak1808	Knapsack (NOI18_knapsack)	C++17	100 / 100	135 ms	34768 KiB

knapsack

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <chrono>
using namespace __gnu_pbds;
using namespace std;
using namespace std::chrono;
template <class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <class T>
using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int MOD = 998244353;
int add(int x, int y){
    return ((x + y) % MOD + MOD) % MOD;
}
int mul(int x, int y){
    return x * 1ll * y % MOD;   
}
int binpow(int x, int y){
    int z = 1;
    while(y){
        if(y % 2 == 1) z = mul(z, x);
        x = mul(x, x);
        y /= 2;
    }
    return z;
}
int inv(int x){
    return binpow(x, MOD - 2);    
}
int divide(int x, int y){
    return mul(x, inv(y));
}
int main(){
    int s, n;
    cin>>s>>n;
    map<int, vector<pair<int, int>>>mp;
    for(int i = 1;i<=n;i++){
        int v, w, k;
        cin>>v>>w>>k;
        mp[w].push_back({v, k});
    }
    for(auto &x : mp){
        sort((x.second).begin(), (x.second).end(), greater<pair<int, int>>());
    }
    vector<vector<long long>>dp(int(mp.size()), vector<long long>(s+1, 0LL));
    auto it = mp.begin();
    long long res = 0;
    for(int i = 0;i<int(mp.size());i++){
        for(int use = 0; use <= s; use++){
            int sum = 0;
            long long val = 0;
            dp[i][use] = (i-1 >= 0?dp[i-1][use]:0LL);
            for(auto &x : it->second){
                int v = x.second;
                int c = x.first;
                bool done= false;
                while(v--){
                    sum += it->first;
                    if(sum > use){
                        done = true;
                        break;
                    }
                    val += c;
                    dp[i][use] = max(dp[i][use], (i-1 >= 0?dp[i-1][use-sum]:0LL) + val);
                }
                if(done)break;
            }
            res = max(res, dp[i][use]);
        }
        it++;
    }
    cout<<res<<"\n";
}

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