Submission #1315498

#	Time	Username	Problem	Language	Result	Execution time	Memory
1315498		ilovewaguri	Knapsack (NOI18_knapsack)	C++20	0 / 100	0 ms	332 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;
#define NAME "TEST"
#define nl '\n'
#define allofa(x,sz) x+1,x+sz+1
#define allof(x) x.begin(),x.end()
#define mset(x,val) memset(x,val,sizeof(x))
template<typename T> T Max(T x, T y){return(x>y)?x:y;};
template<typename T> T Min(T x, T y){return(x<y)?x:y;};
template<class X,class Y> bool minimize(X &a, Y b){if(a>b){a=b;return true;}return false;};
template<class X,class Y> bool maximize(X &a, Y b){if(a<b){a=b;return true;}return false;};
typedef long long ll;
const ll mod = (long long)1e9+7;
const ll LINF = (long long)1e18;
const int INF = (int)1e9;
const int MAXN = (int)1e5+5;
const int MAXV = (int)1e6+5;
int v[MAXN],w[MAXN],k[MAXN];
int s,n;

void ccps() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    if(fopen(NAME".inp","r")) {
        freopen(NAME".inp","r",stdin);
        freopen(NAME".out","w",stdout);
    }
}

namespace sub2 {
    const int V = 2010;
    ll dp[V];

    bool check() {
        for (int i = 1; i<=n; i++) {
            if(k[i]!=1) return false;
        }
        return n<=100;
    }

    void sol() {
        fill(allofa(dp,s),0);
        for (int i = 1; i<=n; i++) {
            for (int c = w[i]; c<=s; c++) {
                maximize(dp[c],dp[c-w[i]]+v[i]);
            }
        }
        cout << dp[s];
    }
}

namespace sub3 {
    const int V = 2010;
    ll dp[V];

    bool check() {
        for (int i = 1; i<=n; i++) {
            if(k[i]>10) return false;
        }
        return n<=100;
    }

    void sol() {
        for (int i = 1; i<=n; i++) {
            for (int c = s; c>=w[i]; c--) {
                for (int t = 1; t<=k[i]; t++) {
                    maximize(dp[c],dp[c-t*w[i]]+1LL*t*v[i]);
                }
            }
        }
        cout << dp[s];
    }
}

signed main() {
    ccps();
    cin >> s >> n;
    for (int i = 1; i<=n; i++) {
        cin >> v[i] >> w[i] >> k[i];
    }
    if(sub2::check()) return sub2::sol(),0;
//    else if(sub3::check()) return sub3::sol(),0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void ccps()':
knapsack.cpp:25:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |         freopen(NAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:26:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         freopen(NAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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