Submission #20136

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
20136	2016-02-27 15:47:31	hongjun7	Min-cost GCD (GA9_mcg)	C++14	57 / 100	1000 ms	1212 KiB

mcg

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#include <cstdio>
#include <vector>
#include <map>
#include <algorithm>
using namespace std;
typedef long long ll;
ll a, b, p, q;
map <pair<ll, ll>, ll> d;
ll f(ll x, ll y) {
  if (x == 0 || y == 0) return 0;
  if (d.count({ x, y })) return d[{x, y}];
  ll d1 = f(y, x%y) + p, d2 = 1e18;
  if (x >= y) {
    if ((x / y) <= d1 / q) d2 = f(x % y, y) + (x / y)*q;
  }
  else {
    if ((y / x) <= d1 / q) d2 = f(x, y % x) + (y / x)*q;
  }
  if (d1 > d2) d1 = d2;
  d[{x, y}] = d1;
  return d1;
}
int main() {
  int T;
  for (scanf("%d", &T); T--; ) {
    scanf("%lld%lld%lld%lld", &a, &b, &p, &q);
    d.clear();
    printf("%lld\n", f(a, b));
  }
}
 
 
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• Subtask 1: 14 / 14
• Subtask 2: 16 / 16
• Subtask 3: 27 / 27
• Subtask 4: 0 / 43