結果

問題 No.617 Nafmo、買い出しに行く
ユーザー はむこはむこ
提出日時 2017-12-18 18:04:07
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 33 ms / 2,000 ms
コード長 4,210 bytes
コンパイル時間 3,619 ms
コンパイル使用メモリ 220,696 KB
最終ジャッジ日時 2025-01-05 05:53:31
ジャッジサーバーID
(参考情報)
judge3 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 20
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In member function ‘{anonymous}::MaiScanner& {anonymous}::MaiScanner::operator>>(std::string&)’:
main.cpp:63:9: warning: no return statement in function returning non-void [-Wreturn-type]
   63 |         }
      |         ^

ソースコード

diff #
プレゼンテーションモードにする

#pragma GCC optimize ("O3")
#pragma GCC target ("avx")
#include "bits/stdc++.h" // define macro "/D__MAI"
using namespace std;
typedef long long int ll;
#define xprintf(fmt,...) fprintf(stderr,fmt,__VA_ARGS__)
#define debugv(v) {printf("L%d %s => ",__LINE__,#v);for(auto e:v){cout<<e<<" ";}cout<<endl;}
#define debugm(m) {printf("L%d %s is..\n",__LINE__,#m);for(auto v:m){for(auto e:v){cout<<e<<" ";}cout<<endl;}}
#define debuga(m,w) {printf("L%d %s is => ",__LINE__,#m);for(int x=0;x<(w);x++){cout<<(m)[x]<<" ";}cout<<endl;}
#define debugaa(m,w,h) {printf("L%d %s is..\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[x][y]<<" ";}cout<<endl;}}
#define debugaar(m,w,h) {printf("L%d %s is..\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[y][x]<<" ";}cout<<endl;}}
#define ALL(v) (v).begin(),(v).end()
#define repeat(cnt,l) for(auto cnt=0;cnt<(l);++cnt)
#define iterate(cnt,b,e) for(auto cnt=(b);cnt!=(e);++cnt)
#define MD 1000000007ll
#define PI 3.1415926535897932384626433832795
template<typename T1, typename T2>
ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << "(" << p.first << ":" << p.second << ")"; return o; }
mt19937 mt(8901016);
inline int rand_int(int l, int h) {
return uniform_int_distribution<>(l, h)(mt);
}
#ifdef __MAI
#define getchar_unlocked getchar
#define putchar_unlocked putchar
#endif
#ifdef __VSCC
#define getchar_unlocked _getchar_nolock
#define putchar_unlocked _putchar_nolock
#endif
namespace {
#define isvisiablechar(c) (0x21<=(c)&&(c)<=0x7E)
class MaiScanner {
public:
template<typename T> void input_integer(T& var) {
var = 0;
T sign = 1;
int cc = getchar_unlocked();
for (; cc<'0' || '9'<cc; cc = getchar_unlocked())
if (cc == '-') sign = -1;
for (; '0' <= cc&&cc <= '9'; cc = getchar_unlocked())
var = (var << 3) + (var << 1) + cc - '0';
var = var*sign;
}
inline int c() { return getchar_unlocked(); }
inline MaiScanner& operator>>(int& var) {
input_integer<int>(var);
return *this;
}
inline MaiScanner& operator>>(long long& var) {
input_integer<long long>(var);
return *this;
}
inline MaiScanner& operator>>(string& var) {
int cc = getchar_unlocked();
for (; !isvisiablechar(cc); cc = getchar_unlocked());
for (; isvisiablechar(cc); cc = getchar_unlocked())
var.push_back(cc);
}
template<typename IT> void in(IT begin, IT end) {
for (auto it = begin; it != end; ++it) *this >> *it;
}
};
}
MaiScanner scanner;
ll n, cap;
pair<ll,ll> items[5010]; // <value, weight>
ll imos[5010];
ll best = 0;
void dfs(int index=0, ll value=0, ll weight=0) {
if (cap < weight)
return;
if (index == n) {
best = max(best, value);
return;
}
ll value_lp = value;
ll w = cap - weight;
int i_g;
for (i_g = index; i_g < n && 0 <= w - items[i_g].second; ++i_g) {
w -= items[i_g].second;
value_lp += items[i_g].first;
}
if (i_g == n || w == 0) {
best = max(best, value_lp);
return;
}
//
double lp_opt = value_lp + items[i_g].first * ((w) / (double)items[i_g].second);
if (lp_opt <= best) return;
dfs(index + 1, value + items[index].first, weight + items[index].second);
dfs(index + 1, value, weight);
}
void scan_testcase() {
ll v;
repeat(i, n) {
scanner >> v;
items[i] = make_pair(v, v);
}
}
void gen_testcase() {
n = 100;
cap = n * 30;
repeat(i, n) {
items[i] = make_pair(rand_int(1, 100), rand_int(1, 100));
}
}
int main() {
scanner >> n >> cap;
scan_testcase();
//gen_testcase();
sort(items, items + n, [](auto& l, auto& r) {return l.first*r.second > r.first * l.second; });
repeat(i, n) {
imos[i + 1] = imos[i] + items[i].first;
}
dfs();
cout << best << endl;
return 0;
}
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