제출 #914199

#제출 시각아이디문제언어결과실행 시간메모리
914199May27_thKnapsack (NOI18_knapsack)C++17
29 / 100
2 ms496 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; }; 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)) S/w1 * v1 > S/w2 * v2 w2 * v1 > v2 * w1 **/ 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}); } sort(items.begin(), items.end(), [&](Item &a, Item &b){ return a.v * b.w < b.v * a.w; //return min(S/a.w, a.k) * a.v < min(S/b.w, b.k) * b.v; }); f[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; //cout << v << " " << w << " " << k << "\n"; for(int j = 0; j <= S; j ++){ Maximize(g[j], f[j]); /*for(int t = 1; t <= min(k, j/w); t ++){ Maximize(g[j], f[j - w * t] + v * t); }*/ int t = min(j/w, k); Maximize(g[j], f[j - w * t] + v * t); } 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]); } 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:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         freopen("time.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen("time.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen("A.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen("A.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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