C. Line (扩展欧几里得)
1 second
256 megabytes
standard input
standard output
A line on the plane is described by an equation Ax + By + C = 0. You are to find any point on this line, whose coordinates are integer numbers from - 5·1018 to 5·1018 inclusive, or to find out that such points do not exist.
The first line contains three integers A, B and C ( - 2·109 ≤ A, B, C ≤ 2·109) — corresponding coefficients of the line equation. It is guaranteed that A2 + B2 > 0.
If the required point exists, output its coordinates, otherwise output -1.
2 5 3
6 -3
ax+by+c=0,化为ax+by=-c/gcd(a,b)*gcd(a,b),
套拓展欧几里得就可以解出了
#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + ;
const int mod = 1e9 + ;
typedef long long LL;
LL exgcd(LL a, LL b, LL &x, LL &y) {
if (b == ) {
x = , y = ;
return a;
}
LL g = exgcd(b, a % b, x, y);
LL t;
t = x, x = y, y = t - (a / b) * y;
return g;
}
int main() {
LL a, b, c, x, y;
cin >> a >> b >> c;
LL t = exgcd(a, b, x, y);
if (c % t == ) printf("%lld %lld\n", -x * c / t, -y * c / t);
else printf("-1\n");
return ;
}
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