Submission #540575

#	Time	Username	Problem	Language	Result	Execution time	Memory
540575		ac2hu	Knapsack (NOI18_knapsack)	C++14	73 / 100	1096 ms	53456 KiB

knapsack

#include <bits/stdc++.h>
#ifdef DEBUG
#include "../templates/debug.h"
#else 
#define deb(x...)
#endif
using namespace std;
struct Scanner {
    FILE* fp = nullptr;
    char line[(1 << 15) + 1];
    size_t st = 0, ed = 0;
    void reread() {
        memmove(line, line + st, ed - st);
        ed -= st;
        st = 0;
        ed += fread(line + ed, 1, (1 << 15) - ed, fp);
        line[ed] = '\0';
    }
    bool succ() {
        while (true) {
            if (st == ed) {
                reread();
                if (st == ed) return false;
            }
            while (st != ed && isspace(line[st])) st++;
            if (st != ed) break;
        }
        if (ed - st <= 50) reread();
        return true;
    }
    template <class T, enable_if_t<is_same<T, string>::value, int> = 0>
    bool read_single(T& ref) {
        if (!succ()) return false;
        while (true) {
            size_t sz = 0;
            while (st + sz < ed && !isspace(line[st + sz])) sz++;
            ref.append(line + st, sz);
            st += sz;
            if (!sz || st != ed) break;
            reread();            
        }
        return true;
    }
    template <class T, enable_if_t<is_integral<T>::value, int> = 0>
    bool read_single(T& ref) {
        if (!succ()) return false;
        bool neg = false;
        if (line[st] == '-') {
            neg = true;
            st++;
        }
        ref = T(0);
        while (isdigit(line[st])) {
            ref = 10 * ref + (line[st++] - '0');
        }
        if (neg) ref = -ref;
        return true;
    }
    template <class T> bool read_single(vector<T>& ref) {
        for (auto& d : ref) {
            if (!read_single(d)) return false;
        }
        return true;
    }
    void read() {}
    template <class H, class... T> void read(H& h, T&... t) {
        bool f = read_single(h);
        assert(f);
        read(t...);
    }
    Scanner(FILE* _fp) : fp(_fp) {}
};
 
struct Printer {
  public:
    template <bool F = false> void write() {}
    template <bool F = false, class H, class... T>
    void write(const H& h, const T&... t) {
        if (F) write_single(' ');
        write_single(h);
        write<true>(t...);
    }
    template <class... T> void writeln(const T&... t) {
        write(t...);
        write_single('\n');
    }
 
    Printer(FILE* _fp) : fp(_fp) {}
    ~Printer() { flush(); }
 
  private:
    static constexpr size_t SIZE = 1 << 15;
    FILE* fp;
    char line[SIZE], small[50];
    size_t pos = 0;
    void flush() {
        fwrite(line, 1, pos, fp);
        pos = 0;
    }
    void write_single(const char& val) {
        if (pos == SIZE) flush();
        line[pos++] = val;
    }
    template <class T, enable_if_t<is_integral<T>::value, int> = 0>
    void write_single(T val) {
        if (pos > (1 << 15) - 50) flush();
        if (val == 0) {
            write_single('0');
            return;
        }
        if (val < 0) {
            write_single('-');
            val = -val;  // todo min
        }
        size_t len = 0;
        while (val) {
            small[len++] = char('0' + (val % 10));
            val /= 10;
        }
        for (size_t i = 0; i < len; i++) {
            line[pos + i] = small[len - 1 - i];
        }
        pos += len;
    }
    void write_single(const string& s) {
        for (char c : s) write_single(c);
    }
    void write_single(const char* s) {
        size_t len = strlen(s);
        for (size_t i = 0; i < len; i++) write_single(s[i]);
    }
    template <class T> void write_single(const vector<T>& val) {
        auto n = val.size();
        for (size_t i = 0; i < n; i++) {
            if (i) write_single(' ');
            write_single(val[i]);
        }
    }
};
#define int long long 
int items[2][(int)1e7 + 10];
signed main() {
    Scanner sc(stdin);
    Printer p(stdout);
    int s,n;sc.read(s,n);
    vector<array<int,3>> iitems(n);
    int siz =0 ;
    for(int i = 0;i<n;i++){
            for(int j = 0;j<3;j++)sc.read(iitems[i][j]);
            iitems[i][2] = min(iitems[i][2], s);
    }
    for(int i = 0;i<n;i++){
        while(iitems[i][2] > 0){
            int lg = log2(iitems[i][2]);
            iitems[i][2] -= (1 << lg);
            deb(i, lg);
            items[0][siz] = iitems[i][0];
            items[1][siz++] = iitems[i][1];
            for(int mask =0;mask<lg;mask++){
                    items[0][siz] = iitems[i][0]*(1 << mask);
                    items[1][siz++] = iitems[i][1]*(1 << mask);
            }
        }
    }
    vector<int> old((int)2e3 + 10), ne((int)2e3 + 10);
    for(int i = 0;i<siz;i++){
            swap(old, ne);
            for(int j = 1;j<=s;j++){
                    ne[j] = max(old[j], ne[j - 1]);
                    if(j >= items[1][i])
                            ne[j] = max(ne[j], old[j - items[1][i]] + items[0][i]);
            }
    }
    p.writeln(ne[s]);
}

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