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39 lines
906 B
C++
39 lines
906 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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#define CRP(t, x) const t &x
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#define OPL(t, x) bool operator<(CRP(t, x)) const
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#define FIL(x, v) memset(x, v, sizeof(x))
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#define CLR(x) FIL(x, 0)
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#define NE1(x) FIL(x, -1)
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#define INF(x) FIL(x, 0x3f)
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typedef long long ll, i64;
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ll gcd(ll a, ll b) { return b == 0 ? a : gcd(b, a % b); }
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ll f(ll n, ll m)
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{
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ll x = n;
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do
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if (gcd(++x, n) == 1) m--;
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while (m);
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return x;
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}
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int main()
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{
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ll T, k, m;
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scanf("%lld", &T);
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while (T--)
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{
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scanf("%lld%lld", &k, &m);
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bool flag = true;
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for (ll n = 1; n < 10000; n++)
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if (((f(n, m) - n) ^ n) == k)
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{
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printf("%lld\n", n);
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flag = false;
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break;
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}
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if (flag) puts("-1");
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}
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return 0;
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} |