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USACO Section 2.1 Ordered Fractions
/* ID: lucien23 PROG: frac1 LANG: C++ */ #include <iostream> #include <fstream> #include <vector> #include <algorithm> using namespace std; typedef struct Fraction { int numerator; int denominator; Fraction(){} Fraction(int x, int y) { numerator = x; denominator = y; } } Fraction; bool isPrimes(int x, int y); bool compFrac(Fraction frac1, Fraction frac2) { if (frac1.numerator/(double)frac1.denominator < frac2.numerator/(double)frac2.denominator) { return true; } return false; } int main() { ifstream infile("frac1.in"); ofstream outfile("frac1.out"); if(!infile || !outfile) { cout << "file operation failure!" << endl; return -1; } int N; infile >> N; vector<Fraction> fractions; fractions.push_back(Fraction(0, 1)); fractions.push_back(Fraction(1, 1)); for (int i=1; i<=N; i++) { for (int j=1; j<i; j++) { if (isPrimes(j, i)) { fractions.push_back(Fraction(j, i)); } } } sort(fractions.begin(), fractions.end(), compFrac); for (vector<Fraction>::iterator it=fractions.begin(); it!=fractions.end(); it++) { outfile << it->numerator << "/" <<it->denominator << endl; } return 0; } /* *判断两数是否互质 */ bool isPrimes(int x, int y) { for (int i=2; i<=x; i++) { if (x%i == 0 && y%i == 0) { return false; } } return true; }
USACO Section 2.1 Ordered Fractions
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