#include <cstdio>
#include <set>
#include <algorithm>
void findAllDividers(int n, std::set<int>& dividers)
{
int m = n;
for (int i = 2; i <= m && i * i <= n; ++i) {
while (m % i == 0) {
std::set<int> newDividers(dividers.begin(), dividers.end());
for (auto it = dividers.begin(); it != dividers.end(); ++it) {
newDividers.insert(i * *it);
}
newDividers.insert(i);
std::swap(dividers, newDividers);
m /= i;
}
}
}
int main()
{
int n;
int result = 0;
scanf("%d", &n);
std::set<int> nDividers;
findAllDividers(n, nDividers);
nDividers.insert(1);
for (auto nIt = nDividers.begin(); nIt != nDividers.end() && *nIt <= (n / 7); ++nIt) {
std::set<int> mDividers;
int m = n / *nIt - 1;
findAllDividers(m, mDividers);
for (auto mIt = mDividers.begin(); mIt != mDividers.end() && *mIt <= (m / 3); ++mIt) {
result++;
}
}
printf("%d", result);
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | #include <cstdio> #include <set> #include <algorithm> void findAllDividers(int n, std::set<int>& dividers) { int m = n; for (int i = 2; i <= m && i * i <= n; ++i) { while (m % i == 0) { std::set<int> newDividers(dividers.begin(), dividers.end()); for (auto it = dividers.begin(); it != dividers.end(); ++it) { newDividers.insert(i * *it); } newDividers.insert(i); std::swap(dividers, newDividers); m /= i; } } } int main() { int n; int result = 0; scanf("%d", &n); std::set<int> nDividers; findAllDividers(n, nDividers); nDividers.insert(1); for (auto nIt = nDividers.begin(); nIt != nDividers.end() && *nIt <= (n / 7); ++nIt) { std::set<int> mDividers; int m = n / *nIt - 1; findAllDividers(m, mDividers); for (auto mIt = mDividers.begin(); mIt != mDividers.end() && *mIt <= (m / 3); ++mIt) { result++; } } printf("%d", result); return 0; } |
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