結果

問題 No.3022 一元一次式 mod 1000000000
コンテスト
ユーザー 👑 null
提出日時 2025-02-15 00:37:46
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 3,908 bytes
コンパイル時間 13,006 ms
コンパイル使用メモリ 604,284 KB
実行使用メモリ 6,824 KB
最終ジャッジ日時 2025-02-15 00:38:00
合計ジャッジ時間 10,416 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge4
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
other AC * 12 WA * 8
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 function ‘void scans(std::string&)’:
main.cpp:79:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   79 |         scanf("%c", &c);
      |         ~~~~~^~~~~~~~~~
main.cpp:80:28: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   80 |         if (c == '\n')scanf("%c", &c);
      |                       ~~~~~^~~~~~~~~~
main.cpp:83:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   83 |                 scanf("%c", &c);
      |                 ~~~~~^~~~~~~~~~
main.cpp: In function ‘void scanc(char&)’:
main.cpp:89:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   89 |         scanf("%c", &c);
      |         ~~~~~^~~~~~~~~~
main.cpp:92:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   92 |                 scanf("%c", &c);
      |                 ~~~~~^~~~~~~~~~
main.cpp: In function ‘int main()’:
main.cpp:159:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  159 |         scanf("%d", &t);
      |         ~~~~~^~~~~~~~~~
main.cpp:163:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  163 |                 scanf("%lld%lld", &n, &m);
      |                 ~~~~~^~~~~~~~~~~~~~~~~~~~

ソースコード

diff #
raw source code 

/*
このコード、と～おれ!
Be accepted!
∧＿∧　
（｡･ω･｡)つ━☆・*。
⊂　　 ノ 　　　・゜+.
　しーＪ　　　°。+ *´¨)
 　　　　　　　　　.· ´¸.·*´¨) ¸.·*¨)
		  　　　　　　　　　　(¸.·´ (¸.·'* ☆
*/

#include <cstdio>
#include <algorithm>
#include <string>
#include <cmath>
#include <cstring>
#include <vector>
#include <numeric>
#include <iostream>
#include <random>
#include <map>
#include <unordered_map>
#include <queue>
#include <regex>
#include <functional>
#include <complex>
#include <list>
#include <cassert>
#include <iomanip>
#include <set>
#include <stack>
#include <bitset>
#include <array>
#include <chrono>
#include <unordered_set>
#include <charconv>
#include <cstdint>

//#pragma GCC target("arch=skylake-avx512")
#pragma GCC target("avx2")
//#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
//#pragma GCC target("sse4")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define repeat(i, n, m) for(int i = n; i < (m); ++i)
#define rep(i, n) for(int i = 0; i < (n); ++i)
#define printynl(a) printf(a ? "yes\n" : "no\n")
#define printyn(a) printf(a ? "Yes\n" : "No\n")
#define printYN(a) printf(a ? "YES\n" : "NO\n")
#define printim(a) printf(a ? "possible\n" : "imposible\n")
#define printdb(a) printf("%.50lf\n", a)
#define printLdb(a) printf("%.50Lf\n", a)
#define printdbd(a) printf("%.16lf\n", a)
#define prints(s) printf("%s\n", s.c_str())
#define all(x) (x).begin(), (x).end()
#define deg_to_rad(deg) (((deg)/360.0L)*2.0L*PI)
#define rad_to_deg(rad) (((rad)/2.0L/PI)*360.0L)
#define Please return
#define AC 0
#define manhattan_dist(a, b, c, d) (abs(a - c) + abs(b - d))

using ll = long long;
using ull = unsigned long long;

constexpr int INF = 1073741823;
constexpr int MINF = -1073741823;
constexpr ll LINF = ll(4661686018427387903);
constexpr ll MOD = 1e9 + 7;
constexpr ll mod = 998244353;
constexpr long double eps = 1e-14;
const long double PI = acosl(-1.0L);

using namespace std;

void scans(string& str) {
	char c;
	str = "";
	scanf("%c", &c);
	if (c == '\n')scanf("%c", &c);
	while (c != '\n' && c != -1 && c != ' ') {
		str += c;
		scanf("%c", &c);
	}
}

void scanc(char& str) {
	char c;
	scanf("%c", &c);
	if (c == -1)return;
	while (c == '\n') {
		scanf("%c", &c);
	}
	str = c;
}

double acot(double x) {
	return PI / 2 - atan(x);
}

ll LSB(ll n) { return (n & (-n)); }

template<typename T>
inline T chmin(T& a, const T& b) {
	if (a > b)a = b;
	return a;
}

template<typename T>
inline T chmax(T& a, const T& b) {
	if (a < b)a = b;
	return a;
}

//cpp_int
#if __has_include(<boost/multiprecision/cpp_int.hpp>)
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
using namespace boost::multiprecision;
#else
using cpp_int = ll;
#endif

//atcoder library
#if __has_include(<atcoder/all>)
#include <atcoder/all>
//using namespace atcoder;
#endif

/*
	random_device seed_gen;
	mt19937 engine(seed_gen());
	uniform_int_distribution dist(1, 100);
*/


/*----------------------------------------------------------------------------------*/

ll euclid_inv(ll a, ll b, ll& x, ll& y) {
	if (b == 0) {
		x = 1;
		y = 0;
		return a;
	}
	ll d = euclid_inv(b, a % b, y, x);
	y -= a / b * x;
	return d;
}

ll modinv(ll a, ll m) {
	ll x, y;
	euclid_inv(a, m, x, y);
	return (x % m + m) % m;
}

int main() {

	int t;
	scanf("%d", &t);
	ll mod = 1e9;
	while (t--) {
		ll n, m;
		scanf("%lld%lld", &n, &m);
		n %= mod;
		m %= mod;
		m = mod - m;
		m %= mod;
		if (gcd(n, mod) == 1) {
			n = modinv(n, mod);
			m *= n;
			m %= mod;
			if (m <= 0)m += mod;
			printf("%lld\n", m);
		}
		else if (n == 0) {
			if (m == 0)puts("1");
			else puts("-1");
		}
		else if (m % n) {
			puts("-1");
			continue;
		}
		else {
			m /= n;
			if (m == 0)m += mod;
			printf("%lld\n", m);
		}
	}

	Please AC;
}
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