Submission #729221

#	Time	Username	Problem	Language	Result	Execution time	Memory
729221		PVSekhar	Knapsack (NOI18_knapsack)	C++14	0 / 100	1 ms	212 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const ll MOD = 1000000007;


int main()
{
    #ifndef ONLINE_JUDGE
        freopen("input.in", "r", stdin);
        freopen("output.out", "w", stdout);
    #endif
    int n,s;
    cin>>s>>n;
    vector<int> dp(s+1,0);
    dp[0]=1;
    map<int,vector<pair<int,int>>> store;
    int v,w,k;
    for (int i = 0; i < n; i++)
    {
        cin>>v>>w>>k;
        store[w].push_back({v,k});
    }
    for (int i = 0; i <= s; i++)
    {
        sort(store[i].begin(),store[i].end());
    }
    int ind=0,x;
    for (int i = 1; i <= s; i++)
    {
        ind=0;
        if(store[i].size()==0)continue;
        for (int j = 0; j <= ceil(s/i); j++)
        {
            if(store[i][ind].second){
                store[i][ind].second--;
                x=store[i][ind].first;
            }else{
                ind++;
                if(ind<store[i].size()){
                    store[i][ind].second--;
                    x=store[i][ind].first;
                }
            }
            if(ind>=store[i].size())break;
            for (int k = s; k >= 0; k--)
            {
                if(dp[k]&&i+k<=s)dp[i+k]=max(dp[i+k],dp[k]+x);
            }
        }
    }
    int ans=0;
    for (int i = 0; i <= s; i++)
    {
        ans=max(ans,dp[i]);
    }
    cout<<ans-1<<endl;
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:40:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |                 if(ind<store[i].size()){
      |                    ~~~^~~~~~~~~~~~~~~~
knapsack.cpp:45:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |             if(ind>=store[i].size())break;
      |                ~~~^~~~~~~~~~~~~~~~~
knapsack.cpp:10:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |         freopen("input.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:11:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |         freopen("output.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:48:59: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   48 |                 if(dp[k]&&i+k<=s)dp[i+k]=max(dp[i+k],dp[k]+x);

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