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222. 青蛙的约会
https://www.acwing.com/problem/content/submission/code_detail/13561119/
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AcWing/222/222.cpp
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46
AcWing/222/222.cpp
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#include <iostream>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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long long x, y, n, m, l;
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long long exgcd(long long a, long long b, long long &x, long long &y) {
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if (!b) {
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x = 1;
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y = 0;
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return a;
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}
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long long g = exgcd(b, a % b, x, y);
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long long t = x;
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x = y;
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y = t - a / b * y;
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return g;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> x >> y >> m >> n >> l;
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long long b = n - m,
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c = x - y,
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xx, yy;
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if (b < 0) {
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b = -b;
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c = -c;
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}
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long long g = exgcd(b, l, xx, yy);
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if (c % g) {
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cout << "Impossible" << endl;
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} else {
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cout << (c / g * xx % (l / g) + (l / g)) % (l / g) << endl;
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}
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return 0;
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}
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