제출 #540575

#제출 시각아이디문제언어결과실행 시간메모리
540575ac2huKnapsack (NOI18_knapsack)C++14
73 / 100
1096 ms53456 KiB
#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]); }
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