제출 #914176

#제출 시각아이디문제언어결과실행 시간메모리
914176May27_thKnapsack (NOI18_knapsack)C++17
12 / 100
1 ms348 KiB
#include <bits/stdc++.h> #define int64_t long long #define double long double using namespace std; using type = int64_t; const long long mod = 1000000007, inf = 1e18; const int base = 33; const int N = 2e5 + 10; const int LG = 20; int dx[] = {1, -1, 0, 0}; int dy[] = {0, 0, 1, -1}; void Minimize(int64_t &a, int64_t b) {if(b < a) a = b;} void Maximize(int64_t &a, int64_t b) {if(b > a) a = b;} void Add(int64_t& a, int64_t b) {a = a + b; a %= mod;} void Dec(int64_t& a, int64_t b) {a = a - b + mod; a %= mod;} int n, S; struct Item{ int64_t v, w, k; }; pair<int64_t, int64_t> f[3000], g[3000]; void Solve(void) { /** n <= 1e5, k <= 1e9; S <= 2000 f[i][j] la max value khi den thg i va dung j space f[i][j] = f[i - 1][j - w * t] + v * t (t <= k) f[i][j] = f[i - 1][j]; g[j] = f[j] g[j] = f[j - w * t] + v * t (t <= min(k, 2000)) **/ cin >> S >> n; vector<Item>items; for(int i = 1; i <= n; i ++){ int64_t v, w, k; cin >> v >> w >> k; items.push_back({v, w, k}); } f[0] = make_pair(0, 0); for(int i = 1; i <= n; i ++){ int64_t w = items[i - 1].w, v = items[i - 1].v, k = items[i - 1].k; for(int j = 0; j <= S; j ++){ g[j] = make_pair(f[j].first, 0); if(j >= w){ //Maximize(g[j], g[j - w] + v); if(g[j].first < g[j - w].first + v && g[j - w].second + 1 <= k){ g[j] = make_pair(g[j - w].first + v, g[j - w].second + 1); } else if(g[j].first == g[j - w].first + v){ if(g[j].second > g[j - w].second + 1){ g[j].second = g[j - w].second + 1; } } } /*for(int t = 1; t <= min(k, j/w); t ++){ Maximize(g[j], f[j - w * t] + v * t); }*/ } //for(int j = 0; j <= S; j ++) Maximize(g[j], f[j]); for(int j = 0; j <= S; j ++){ swap(g[j], f[j]); } } int64_t ans = 0; for(int s = 0; s <= S; s ++){ ans = max(ans, f[s].first); } cout << ans; } int main() { ios::sync_with_stdio(false); cin.tie(nullptr); if(fopen("time.in", "r")){ freopen("time.in", "r", stdin); freopen("time.out", "w", stdout); } if(fopen("A.inp", "r")){ freopen("A.inp", "r", stdin); freopen("A.out", "w", stdout); } int tc = 1; //cin >> tc; while(tc --){ Solve(); } }

컴파일 시 표준 에러 (stderr) 메시지

knapsack.cpp: In function 'int main()':
knapsack.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen("time.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen("time.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen("A.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen("A.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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