Submission #916634

#	Time	Username	Problem	Language	Result	Execution time	Memory
916634		Amr	Knapsack (NOI18_knapsack)	C++14	100 / 100	70 ms	14424 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define S second
#define F first
#define all(x) (x).begin(),(x).end()
#define sz size()
#define Yes cout << "YES" << endl
#define No cout << "NO" << endl
#define pb(x) push_back(x);
#define endl '\n'
#define fast ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
const int N=3e5+7;
ll INF=INT_MAX,mod=1e9+7;
int TT=1;
ll power(ll x, unsigned int y)
{
    ll res = 1;
    x = x; // % mod;
    if (x == 0) return 0;
    while (y > 0)
    {
        if (y & 1) res = (res*x)  ; // % mod;
        y = y>>1;
        x = (x*x) ; // % mod;
    }
    return res;
}
ll dp[N];
vector<pair<ll,ll> > b[N];
void solve()
{
    memset(dp,-1,sizeof dp);
    ll n , s; cin >> n >> s; swap(n,s);
    for(int i = 1; i <= n; i++)
    {
        ll price , w , k ;cin >> price >> w >> k;
        b[w].push_back({price,k});
    }
    for(int i = 1; i <= s; i++) if(b[i].sz)sort(all(b[i]),greater<pair<ll,ll> > ());
    dp[0] = 0;
    for(int i = 1; i<= s; i++)
    {
        if(b[i].sz==0) continue;

        for(int j = s; j>= 0; j--)
        {
            ll c = 1;
            ll cursum = 0;
            ll alllst = 0;
            ll l= 0;
            while(j-i*c>=0&&l<b[i].sz)
            {
                cursum+=b[i][l].F;
                if(dp[j-i*c] !=-1)
                dp[j] = max(dp[j],dp[j-i*c]+cursum);
                if(alllst+b[i][l].S==c) alllst+=b[i][l].S,l++;
                c++;
            }
        }
    }
    ll mx = 0;
    for(int i = 1; i<=s; i++) mx = max(mx,dp[i]);
    cout << mx << endl;
}
int main(){
    //freopen("friday.in","r",stdin);
    //freopen("friday.out","w",stdout);
    fast;
    while(TT--)
        solve();

    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void solve()':
knapsack.cpp:53:30: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |             while(j-i*c>=0&&l<b[i].sz)
      |                              ^

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