I don't understand why my code fails. I have been very careful with all cases. The precision of the numbers, the zero and negative benefits, everything. My code should not have so many lines but I have put them for the frustration of having so many WA. Are you sure test # 2 is ok? Check it with my code. Previously I tried it with a much shorter code that reached test # 7 and failed, but it did not take care of rounding problems, this does and fails in test # 2 X-¿
Help, Please!


// Brute force
#include <stdio.h>
#include <math.h>

long calcMax (int horn_n , int hoof_n,  float horn_b, float  hoof_b ) {

    long max =  (long) horn_b * horn_n + (long) hoof_b * hoof_n - (long) 100 * ( horn_n * horn_n +  hoof_n * hoof_n);
    return max;
}

int passtoInt( char *number) {
    int num = 0, signo = 1, begin = 0;
    char decimal_flag = 'N';
    int dec_ndig = 0;
    if( number[0] == '-')  {
        signo = -1;
        begin = 1;
    }
    for(int i=begin; number[i] != 0; i++) {
        if(number[i] == '.')  {
            decimal_flag = 'Y' ;
            continue;
        }
        if(decimal_flag == 'Y') dec_ndig++;
        if(dec_ndig > 2) break;

        num = num * 10  + (number[i] - '0');

    }
    for(int i = dec_ndig; i < 2; i++) num = num*10;

    return num * signo;
}


void getPartEntAndDec(long num, long *ent, unsigned *dec )  {
    *ent = num / 100;
    *dec = num % 100;

}


int main(void) {
    char horn_s[14],  hoof_s[14];
    int  horn_n= 0, hoof_n = 0, horn = 0, hoof = 0;

    int horn_b, hoof_b;
    long max = 0, max1, max_ent;
    unsigned max_dec;
    int maxmount;

    scanf("%s%s%d", horn_s, hoof_s, &maxmount);
    horn_b = passtoInt( horn_s);
    hoof_b = passtoInt( hoof_s);

    for(int horn_n = 0; horn_n <= maxmount; horn_n++) {
        for(int hoof_n = 0; hoof_n <= maxmount -  horn_n;  hoof_n++) {
            max1 = calcMax (horn_n , hoof_n,  horn_b,  hoof_b );
            if(max1 > max) {
                horn = horn_n;
                hoof = hoof_n;
                max = max1;
            }
        }
    }
    getPartEntAndDec(max, &max_ent, &max_dec );
    printf("%ld.%02u\n", max_ent, max_dec);
    printf("%d %d\n", horn,  hoof);
    return 0;

}