Submission #586835

#	Time	Username	Problem	Language	Result	Execution time	Memory
586835		krit3379	Knapsack (NOI18_knapsack)	C++17	100 / 100	54 ms	3660 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define N 2005

int dp[N],ans;

vector<pair<int,int>> g[N],op;

int main(){
    int n,s,i,v,w,k,cnt;
    scanf("%d %d",&s,&n);
    for(i=1;i<=n;i++){
        scanf("%d %d %d",&v,&w,&k);
        g[w].push_back({v,k});
    }
    for(i=1;i<=s;i++)sort(g[i].begin(),g[i].end(),greater<pair<int,int>>());
    for(i=1;i<=s;i++){
        cnt=0;
        int ma=s/i;
        for(auto [v,k]:g[i]){
            if(cnt+k<=ma){
                cnt+=k;
                while(k--)op.push_back({v,i});
            }
            else{
                k=ma-cnt;
                cnt=ma;
                while(k--)op.push_back({v,i});
            }
            if(cnt==ma)break;
        }
    }
    for(auto [v,w]:op)for(i=s;i>=w;i--)dp[i]=max(dp[i],dp[i-w]+v);
    for(i=0;i<=s;i++)ans=max(ans,dp[i]);
    printf("%d",ans);
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     scanf("%d %d",&s,&n);
      |     ~~~~~^~~~~~~~~~~~~~~
knapsack.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         scanf("%d %d %d",&v,&w,&k);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~

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