app.c for zyy

app.c

#include <stdio.h>

int main(int argc, char const *argv[])
{
    int count;
    double input, output;    
    
    // 0. prepare count
    scanf("%d", &count);
    printf("count: %d\n", count);
    int levels[count + 1];
    double ratios[count + 1];
    count += 1;

    // 1. prepare levels and ratio
    levels[0] = 0;
    ratios[0] = 0;
    for (int i = 1; i < count; i++) {
        scanf("%d %lf", &levels[i], &ratios[i]);
        printf("%d %lf\n", levels[i], ratios[i]);
    }
    scanf("%lf", &input);
    printf("input: %.2f\n", input);
    
    // 2. process
    for (int i = 1; i < count - 1; i++) {
        // reach the level ceiling, break
        if (input < levels[i]) {
            output += (input - levels[i - 1]) * ratios[i];
            printf("stage 1 %.2f\n", output);

            break;
        }
        // accumulate current level
        output += (levels[i] - levels[i - 1]) * ratios[i];
        printf("stage 2 %.2f\n", output);
    }
    // last level
    if (input > levels[count - 2]) {
        output += (input - levels[count - 1 - 1]) * ratios[count - 1];
        printf("stage 3 %.2f\n", output);
    }

    // 3. output
    printf("%.2f", output);
    
    return 0;
}

// gcc app.c
// echo '3\n1000 0.1\n2000 0.2\n-1 0.3\n2500' | ./a.out
// echo '6\n100000 0.1\n200000 0.075\n400000 0.05\n600000 0.03\n1000000 0.015\n-1 0.01\n150000' | ./a.out