31 lines
565 B
C++
31 lines
565 B
C++
#include <bits/stdc++.h>
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using namespace std;
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typedef long long LL;
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int exgcd(int a, int b, int &x, int &y) {
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if (!b) {
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x = 1, y = 0;
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return a;
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}
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int d = exgcd(b, a % b, y, x);
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y -= a / b * x;
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return d;
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}
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int main() {
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int n;
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cin >> n;
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while (n--) {
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int a, b, m;
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cin >> a >> b >> m;
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int x, y;
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int d = exgcd(a, m, x, y);
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if (b % d)
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puts("impossible");
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else
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printf("%d\n", (LL)b / d * x % m);
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}
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return 0;
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} |