freq.cpp

#include <iostream>
#include <set>
#include <utility>
using namespace std;

int main() {
    FILE* fin = fopen("freq.txt","r");

    set<double> freqs;
    double n;
    while(fscanf(fin,"%lf",&n) != EOF) {
        freqs.insert(n);
    }    
    printf("Done insertion\n");

    double x,y,z;
    printf("X: ");
    cin >> x;
    printf("Y: ");
    cin >> y;
    printf("Z: ");
    cin >> z;

    int CAP = 300;
    for (int a = -CAP; a <= CAP; a++) {
        for (int b = -CAP; b <= CAP; b++) {
            for (int c = -CAP; c <= CAP; c++) {
                double curFreq = (double)(((int)((a*x + b*y + c*z) * 10 + 0.5))/10.0);
                if (freqs.count(curFreq)) {
                    freqs.erase(curFreq);
                    printf("%d(%.2lf) + %d(%.2lf) + %d(%.2lf) = %.2lf\n",a,x,b,y,c,z,curFreq);
                }
            }
        }
    }
    
    return 0;
}