33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
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#include <iostream>
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#include <cmath>
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#include <chrono>
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#define lmax 1500000
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using namespace std;
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typedef unsigned char byte;
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inline int isqrt(int n) {
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return (int)sqrt((float)n);
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}
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inline uint64_t isqrt(uint64_t n) {
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return (uint64_t)sqrt((double)n);
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}
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int main() {
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auto start = chrono::system_clock::now();
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for (uint64_t i = isqrt(10203040506070809ull); i <= isqrt(19293949596979899ull); i++) {
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uint64_t square = i*i;
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if (square % 10ull == 9 && (square/100ull) % 10ull == 8 && (square/10000ull) % 10ull == 7 && (square/1000000ull) % 10ull == 6 && (square/100000000ull) % 10ull == 5 && (square/10000000000ull) % 10ull == 4 && (square/1000000000000ull) % 10ull == 3 && (square/100000000000000ull) % 10ull == 2 && (square/10000000000000000ull) == 1)
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cout << "found " << i << " ^2 = " << square << endl;
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}
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auto end = std::chrono::system_clock::now();
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std::chrono::duration<double> elapsed_seconds = end-start;
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cout << "iterating took: " << elapsed_seconds.count() << endl;
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return 0;
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}
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