/* * 6428.cpp * * Created on: Sep 3, 2014 * Author: ghooo */ #include <cstring> #include <map> #include <deque> #include <queue> #include <stack> #include <sstream> #include <iostream> #include <iomanip> #include <cstdio> #include <cmath> #include <cstdlib> #include <ctime> #include <algorithm> #include <vector> #include <set> #include <complex> #include <list> #include <climits> #include <cctype> #include <bitset> //#include <windows.h> using namespace std; #define pb push_back #define all(v) v.begin(),v.end() #define rall(v) v.rbegin(),v.rend() #define sz(v) ((ll)v.size()) #define rep(i,m) for(int i=0;i<(int)(m);++i) #define repe(i,n,m) for(int i=n;i<=(int)(m);++i) #define rep2(i,n,m) for(int i=n;i<(int)(m);i++) #define For(it,c) for(__typeof(c.begin()) it=c.begin();it!=c.end();++it) #define reset(a,b) memset(a,b,sizeof(a)) #define mp make_pair #define dot(a,b) ((conj(a)*(b)).X) #define X real() #define Y imag() #define length(V) (hypot((V).X,(V).Y)) #define vect(a,b) ((b)-(a)) #define cross(a,b) ((conj(a)*(b)).imag()) #define normalize(v) ((v)/length(v)) #define rotate(p,about,theta) ((p-about)*exp(point(0,theta))+about) #define pointEqu(a,b) (comp(a.X,b.X)==0 && comp(a.Y,b.Y)==0) #define clrq(x) while(!x.empty()) x.pop(); #define clrvv(v) rep(i,sz(v))v[i].clear(); #define PRINT false #define debug(x) if(PRINT)cerr << #x << ": " << x << endl; #define debugv(v) cerr << #v << ": ";For(it,v)cerr <<(*it)<<", "; cerr<<endl; typedef stringstream ss; //typedef long long ll; typedef pair<int, int> pii; typedef vector<pii> vpii; typedef vector<string> vs; typedef vector<int> vi; typedef vector<double> vd; typedef vector<vector<int> > vii; typedef long double ld; typedef complex<double> point; typedef pair<point, point> segment; typedef pair<double, point> circle; typedef vector<point> polygon; typedef unsigned long long ull; //typedef long long ll; //============================================================== // handling triples #define tfirst first #define tsecond second.first #define tthird second.second #define mt(x,y,z) mp(x,mp(y,z)) //--------------------------------------------------------------- const int oo = (int) 1e9; const double PI = 2 * acos(0.0); const double eps = 1e-9; // base and base_digits must be consistent const int base = 1000000000; const int base_digits = 9; struct bigint { vector<int> a; int sign; bigint() : sign(1) { } bigint(long long v) { *this = v; } bigint(const string &s) { read(s); } void operator=(const bigint &v) { sign = v.sign; a = v.a; } void operator=(long long v) { sign = 1; if (v < 0) sign = -1, v = -v; for (; v > 0; v = v / base) a.push_back(v % base); } bigint operator+(const bigint &v) const { if (sign == v.sign) { bigint res = v; for (int i = 0, carry = 0; i < (int) max(a.size(), v.a.size()) || carry; ++i) { if (i == (int) res.a.size()) res.a.push_back(0); res.a[i] += carry + (i < (int) a.size() ? a[i] : 0); carry = res.a[i] >= base; if (carry) res.a[i] -= base; } return res; } return *this - (-v); } bigint operator-(const bigint &v) const { if (sign == v.sign) { if (abs() >= v.abs()) { bigint res = *this; for (int i = 0, carry = 0; i < (int) v.a.size() || carry; ++i) { res.a[i] -= carry + (i < (int) v.a.size() ? v.a[i] : 0); carry = res.a[i] < 0; if (carry) res.a[i] += base; } res.trim(); return res; } return -(v - *this); } return *this + (-v); } void operator*=(int v) { if (v < 0) sign = -sign, v = -v; for (int i = 0, carry = 0; i < (int) a.size() || carry; ++i) { if (i == (int) a.size()) a.push_back(0); long long cur = a[i] * (long long) v + carry; carry = (int) (cur / base); a[i] = (int) (cur % base); //asm("divl %%ecx" : "=a"(carry), "=d"(a[i]) : "A"(cur), "c"(base)); } trim(); } bigint operator*(int v) const { bigint res = *this; res *= v; return res; } friend pair<bigint, bigint> divmod(const bigint &a1, const bigint &b1) { int norm = base / (b1.a.back() + 1); bigint a = a1.abs() * norm; bigint b = b1.abs() * norm; bigint q, r; q.a.resize(a.a.size()); for (int i = a.a.size() - 1; i >= 0; i--) { r *= base; r += a.a[i]; int s1 = r.a.size() <= b.a.size() ? 0 : r.a[b.a.size()]; int s2 = r.a.size() <= b.a.size() - 1 ? 0 : r.a[b.a.size() - 1]; int d = ((long long) base * s1 + s2) / b.a.back(); r -= b * d; while (r < 0) r += b, --d; q.a[i] = d; } q.sign = a1.sign * b1.sign; r.sign = a1.sign; q.trim(); r.trim(); return make_pair(q, r / norm); } bigint operator/(const bigint &v) const { return divmod(*this, v).first; } bigint operator%(const bigint &v) const { return divmod(*this, v).second; } void operator/=(int v) { if (v < 0) sign = -sign, v = -v; for (int i = (int) a.size() - 1, rem = 0; i >= 0; --i) { long long cur = a[i] + rem * (long long) base; a[i] = (int) (cur / v); rem = (int) (cur % v); } trim(); } bigint operator/(int v) const { bigint res = *this; res /= v; return res; } int operator%(int v) const { if (v < 0) v = -v; int m = 0; for (int i = a.size() - 1; i >= 0; --i) m = (a[i] + m * (long long) base) % v; return m * sign; } void operator+=(const bigint &v) { *this = *this + v; } void operator-=(const bigint &v) { *this = *this - v; } void operator*=(const bigint &v) { *this = *this * v; } void operator/=(const bigint &v) { *this = *this / v; } bool operator<(const bigint &v) const { if (sign != v.sign) return sign < v.sign; if (a.size() != v.a.size()) return a.size() * sign < v.a.size() * v.sign; for (int i = a.size() - 1; i >= 0; i--) if (a[i] != v.a[i]) return a[i] * sign < v.a[i] * sign; return false; } bool operator>(const bigint &v) const { return v < *this; } bool operator<=(const bigint &v) const { return !(v < *this); } bool operator>=(const bigint &v) const { return !(*this < v); } bool operator==(const bigint &v) const { return !(*this < v) && !(v < *this); } bool operator!=(const bigint &v) const { return *this < v || v < *this; } void trim() { while (!a.empty() && !a.back()) a.pop_back(); if (a.empty()) sign = 1; } bool isZero() const { return a.empty() || (a.size() == 1 && !a[0]); } bigint operator-() const { bigint res = *this; res.sign = -sign; return res; } bigint abs() const { bigint res = *this; res.sign *= res.sign; return res; } long long longValue() const { long long res = 0; for (int i = a.size() - 1; i >= 0; i--) res = res * base + a[i]; return res * sign; } friend bigint gcd(const bigint &a, const bigint &b) { return b.isZero() ? a : gcd(b, a % b); } friend bigint lcm(const bigint &a, const bigint &b) { return a / gcd(a, b) * b; } void read(const string &s) { sign = 1; a.clear(); int pos = 0; while (pos < (int) s.size() && (s[pos] == '-' || s[pos] == '+')) { if (s[pos] == '-') sign = -sign; ++pos; } for (int i = s.size() - 1; i >= pos; i -= base_digits) { int x = 0; for (int j = max(pos, i - base_digits + 1); j <= i; j++) x = x * 10 + s[j] - '0'; a.push_back(x); } trim(); } friend istream& operator>>(istream &stream, bigint &v) { string s; stream >> s; v.read(s); return stream; } friend ostream& operator<<(ostream &stream, const bigint &v) { if (v.sign == -1) stream << '-'; stream << (v.a.empty() ? 0 : v.a.back()); for (int i = (int) v.a.size() - 2; i >= 0; --i) stream << setw(base_digits) << setfill('0') << v.a[i]; return stream; } static vector<int> convert_base(const vector<int> &a, int old_digits, int new_digits) { vector<long long> p(max(old_digits, new_digits) + 1); p[0] = 1; for (int i = 1; i < (int) p.size(); i++) p[i] = p[i - 1] * 10; vector<int> res; long long cur = 0; int cur_digits = 0; for (int i = 0; i < (int) a.size(); i++) { cur += a[i] * p[cur_digits]; cur_digits += old_digits; while (cur_digits >= new_digits) { res.push_back(int(cur % p[new_digits])); cur /= p[new_digits]; cur_digits -= new_digits; } } res.push_back((int) cur); while (!res.empty() && !res.back()) res.pop_back(); return res; } typedef vector<long long> vll; static vll karatsubaMultiply(const vll &a, const vll &b) { int n = a.size(); vll res(n + n); if (n <= 32) { for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) res[i + j] += a[i] * b[j]; return res; } int k = n >> 1; vll a1(a.begin(), a.begin() + k); vll a2(a.begin() + k, a.end()); vll b1(b.begin(), b.begin() + k); vll b2(b.begin() + k, b.end()); vll a1b1 = karatsubaMultiply(a1, b1); vll a2b2 = karatsubaMultiply(a2, b2); for (int i = 0; i < k; i++) a2[i] += a1[i]; for (int i = 0; i < k; i++) b2[i] += b1[i]; vll r = karatsubaMultiply(a2, b2); for (int i = 0; i < (int) a1b1.size(); i++) r[i] -= a1b1[i]; for (int i = 0; i < (int) a2b2.size(); i++) r[i] -= a2b2[i]; for (int i = 0; i < (int) r.size(); i++) res[i + k] += r[i]; for (int i = 0; i < (int) a1b1.size(); i++) res[i] += a1b1[i]; for (int i = 0; i < (int) a2b2.size(); i++) res[i + n] += a2b2[i]; return res; } bigint operator*(const bigint &v) const { vector<int> a6 = convert_base(this->a, base_digits, 6); vector<int> b6 = convert_base(v.a, base_digits, 6); vll a(a6.begin(), a6.end()); vll b(b6.begin(), b6.end()); while (a.size() < b.size()) a.push_back(0); while (b.size() < a.size()) b.push_back(0); while (a.size() & (a.size() - 1)) a.push_back(0), b.push_back(0); vll c = karatsubaMultiply(a, b); bigint res; res.sign = sign * v.sign; for (int i = 0, carry = 0; i < (int) c.size(); i++) { long long cur = c[i] + carry; res.a.push_back((int) (cur % 1000000)); carry = (int) (cur / 1000000); } res.a = convert_base(res.a, 6, base_digits); res.trim(); return res; } }; typedef bigint ll; ll eGCD(ll a, ll b, ll &x, ll &y) { x = 1; y = 0; ll nx = 0, ny = 1; ll t, r; while (!b.isZero()) { r = a / b; t = a - r * b; a = b; b = t; t = x - r * nx; x = nx; nx = t; t = y - r * ny; y = ny; ny = t; } return a; } //ax+by=c bool solveLDE(ll a, ll b, ll c, ll &x, ll &y, ll &g) { g = eGCD(a, b, x, y); x *= c / g; y *= c / g; return (c % g) == 0; } //(a*mi)%m=1 ll modInv(ll a, ll m) { ll mi, r; eGCD(a, m, mi, r); return (mi + m) % m; } bigint abs(bigint a) { a.sign = 1; return a; } //(a*x)%b=c bool solve(ll a, ll b, ll c, ll &x) { ll y, g; if (solveLDE(a, b, c, x, y, g) && a * x + b * y == c) { if (x < 0) { x += (abs(x) / b) * b; if (x < 0) x += b; } return 1; } return 0; } int main() { ll a, b, s; while (cin >> a >> b >> s) { ll g = __gcd(a, b); if (s == a) { cout << "YES" << endl; } else if (s == b) { cout << "YES" << endl; } else if (g == 0 || !(s % g).isZero()) { cout << "NO" << endl; } else { a /= g, b /= g, s /= g; ll x, y; eGCD(a, b, x, y); x *= s; y *= s; bool toIncX = false; if (x < y) toIncX = true; if (x < 0) { ll incX = (abs(x) + b - 1) / b; x += incX * b; y -= incX * a; } else if (y < 0) { ll incY = (abs(y) + a - 1) / a; y += incY * a; x -= incY * b; } if (toIncX) a *= -1; else b *= -1; bool f = false; int trials = 50; // Increase the number of trials if you get wrong answer while (trials && !f && x >= 0 && y >= 0) { f = (__gcd(x, y) == 1); trials--; x += b; y += a; } if (f) { cout << "YES" << endl; } else { cout << "NO" << endl; } } } return 0; }
Thursday, September 4, 2014
Solution for Live Archive 6428 - A+B Using Big Integer
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