結果

問題 No.371 ぼく悪いプライムじゃないよ
コンテスト
ユーザー sugim48
提出日時 2016-05-13 22:55:07
言語 C++11
(gcc 15.2.0 + boost 1.89.0)
コンパイル:
g++-15 -O2 -lm -std=gnu++11 -Wuninitialized -DONLINE_JUDGE -o a.out _filename_
実行:
./a.out
結果
WA  
実行時間 -
コード長 1,418 bytes
記録
記録タグの例:
初AC ショートコード 純ショートコード 純主流ショートコード 最速実行時間
コンパイル時間 907 ms
コンパイル使用メモリ 112,640 KB
実行使用メモリ 81,536 KB
最終ジャッジ日時 2026-04-21 03:35:34
合計ジャッジ時間 5,649 ms
ジャッジサーバーID
（参考情報） 		judge1_0 / judge2_1
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 * 4
other AC * 18 WA * 3 TLE * 1 -- * 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
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/ostream:42,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/iostream:43,
                 from main.cpp:5:
In member function 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>]',
    inlined from 'int main()' at main.cpp:69:10:
/home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/bits/ostream.h:212:25: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
  212 |       { return _M_insert(__n); }
      |                ~~~~~~~~~^~~~~
main.cpp: In function 'int main()':
main.cpp:64:12: note: 'ans' was declared here
   64 |         ll ans;
      |            ^~~
In member function 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>]',
    inlined from 'int main()' at main.cpp:51:11:
/home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/bits/ostream.h:212:25: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
  212 |       { return _M_insert(__n); }
      |                ~~~~~~~~~^~~~~
main.cpp: In function 'int main()':
main.cpp:41:28: note: 'ans' was declared here
   41 |                 ll ma = 0, ans;
      |                            ^~~

ソースコード

diff #
raw source code 

#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
typedef pair<int, ll> i_ll;
struct edge { int u, v; ll w; };

double INF = DBL_MAX / 10;
ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

int main() {
	ll lb, ub; cin >> lb >> ub;
	ub++;
	if (ub - lb < 500000) {
		ll ma = 0, ans;
		for (ll x = lb; x < ub; x++)
			for (ll p = 2; p * p <= x; p++)
				if (x % p == 0) {
					if (p >= ma) {
						ma = p;
						ans = x;
					}
					break;
				}
		cout << ans << endl;
		return 0;
	}
	vector<int> a(20000001, -1);
	for (int i = 2; i <= 20000000; i++)
		if (a[i] == -1)
			for (int j = i * 2; j <= 20000000; j += i)
				if (a[j] == -1)
					a[j] = i;
	vector<int> ps;
	for (int x = 500; x <= 100000; x++)
		if (a[x] == -1)
			ps.push_back(x);
	ll ans;
	for (ll p: ps)
		for (ll x = (lb + p - 1) / p * p; x < ub; x += p)
			if (a[x / p] >= p)
				ans = x;
	cout << ans << endl;
}
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