Submission #1126427

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126427		Vivek_03_	Knapsack (NOI18_knapsack)	C++20	73 / 100	1095 ms	1980 KiB

knapsack

#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<set>
#include<map>
#include<unordered_map>
#include<cstdio>
using namespace std;
 
#ifndef LOCAL
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("avx2,popcnt")
#endif
 
#define fastio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define pb push_back
#define ppb pop_back
#define mp make_pair
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
 
#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x <<" "; _print(x); cerr << endl;
#else
#define debug(x)
#endif
 
void _print(ll t) {cerr << t;}
void _print(int t) {cerr << t;}
void _print(string t) {cerr << t;}
void _print(char t) {cerr << t;}
void _print(lld t) {cerr << t;}
void _print(double t) {cerr << t;}
void _print(ull t) {cerr << t;}
void _print(pair<int,int> t) {cerr << t.first << ' '<<t.second;}
 
template <class T> void _print(vector <T> v);
template <class T> void _print(set <T> v);
template <class T> void _print(multiset <T> v);
template <class T> void _print(vector <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T> void _print(set <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T> void _print(multiset <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void _print(map <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void _print(unordered_map <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
 
bool comp(pair<int,int>& a, pair<int,int>& b)
{
    if(a.first!=b.first)
    return a.first > b.first;

    return a.second > b.second;
}

int main()
{
    fastio();
 
    #ifndef ONLINE_JUDGE
        freopen("Error.txt", "w", stderr);
    #endif
 
    int x,n;
    cin>>x>>n;

    unordered_map<int, vector<pair<int,int>>> mp_;

    for(int i=0;i<n;i++)
    {
        int wt, val, k;
        cin>>val>>wt>>k;

        mp_[wt].pb({val,k});
    }

    for(auto it=mp_.begin();it!=mp_.end();it++)
    {
        sort(it->second.begin(), it->second.end(), comp);
    }

    vector<int> dp(x+1,0);

    for(auto it=mp_.begin();it!=mp_.end();it++)
    {
        int wt = it->first;
        vector<pair<int,int>> items = it->second;

        for(int j=0;j<items.size();j++)
        {
            for(int l=1;l<=min(items[j].second, x/wt);l++)
            {
                for(int s=x;s>=wt;s--)
                {
                    dp[s] = max(dp[s-wt] + items[j].first, dp[s]);
                }
            }
        }
    }
    cout<<dp[x]<<'\n';
}   

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen("Error.txt", "w", stderr);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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