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50 lines
1.2 KiB
C++
50 lines
1.2 KiB
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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struct prob
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{
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int a, b;
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OPL(prob, rhs) { return a < rhs.a || (a == rhs.a && b > rhs.b); }
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};
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int main()
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{
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int T, n;
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scanf("%d", &T);
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while (T--)
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{
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priority_queue<prob> H;
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ll hi = 0, lo = 1, g, asum = 0;
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scanf("%d", &n);
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for (int i = 0; i < n; i++)
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{
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prob p;
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scanf("%d%d", &p.a, &p.b);
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if (p.a > p.b) swap(p.a, p.b);
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H.push(p);
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asum += p.a;
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if (i & 1 ^ 1)
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{
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p = H.top();
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hi = (asum - p.a) * (p.a + p.b) + p.a * p.b;
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lo = p.a + p.b;
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}
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else
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{
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hi = asum, lo = 1;
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}
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g = gcd(hi, lo);
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hi /= g, lo /= g;
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printf("%lld/%lld\n", hi, lo);
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}
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}
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return 0;
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} |