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35 lines
629 B
35 lines
629 B
#include <bits/stdc++.h>
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using namespace std;
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#define int long long
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#define endl "\n"
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const int N = 10;
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int n;
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int a[N], m[N];
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void 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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else {
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exgcd(b, a % b, y, x);
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y -= a / b * x;
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}
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}
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signed main() {
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cin >> n;
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int M = 1;
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for (int i = 1; i <= n; i++) {
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cin >> m[i] >> a[i];
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M *= m[i];
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}
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int res = 0, x, y;
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for (int i = 1; i <= n; i++) {
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exgcd(M / m[i], m[i], x, y);
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res += a[i] * M / m[i] * x;
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}
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cout << (res % M + M) % M << endl;
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} |