Submission #846941

#	Time	Username	Problem	Language	Result	Execution time	Memory
846941		batsukh2006	Knapsack (NOI18_knapsack)	C++17	73 / 100	50 ms	5660 KiB

knapsack

#include<iostream>
#include<stdio.h>
#include<math.h>
#include<map>
#include<string>
#include<algorithm>
#include<vector>
#include<string.h>
#include<utility>
#include<set>
#include<cmath>
#include<queue>
#include<deque>
#include<functional>
#include<stack>
#include<limits.h>
#include<iomanip>
#include<unordered_map> 
#include<numeric>
using namespace std;
 
#define MOD 1000000007
#define int long long
#define endl '\n'
bool scnd(pair<int, int> a,pair<int, int> b){
    if(a!=b) return a.first>b.first;
    else return a.second>b.second;
}
void solve(){
    int s,n; cin>>s>>n;
    vector<pair<int, int> > v[s+1];
    for(int i=0; i<n; i++){
        int a,b,c; cin>>a>>b>>c;
        v[b].push_back(make_pair(a,c));
    }
    vector<pair<int, int> > f;
    for(int i=1; i<=s; i++){
        sort(v[i].begin(),v[i].end(),scnd);
        for(int j=0,k=0; j<=s/i; j++){
            if(v[i].size()<=k) break;
            if(v[i][k].second==0) k++;
            if(v[i][k].second>0) f.push_back(make_pair(i,v[i][k].first)),v[i][k].second--;
        }
    }
    vector<int> dp(s+1);
    for(int i=0; i<f.size(); i++){
        for(int j=s; j>=f[i].first; j--){
            dp[j]=max(dp[j],dp[j-f[i].first]+f[i].second);
        }   
    }
    cout<<dp[s];
}
signed main(){
	// freopen("feast.in", "r", stdin);
	// freopen("feast.out", "w", stdout);
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	int t=1;
	// cin>>t;
	while(t--){
		solve();
		cout<<endl;
	}
	return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void solve()':
knapsack.cpp:40:27: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   40 |             if(v[i].size()<=k) break;
      |                ~~~~~~~~~~~^~~
knapsack.cpp:46:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |     for(int i=0; i<f.size(); i++){
      |                  ~^~~~~~~~~

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