50158. Stop the Sequence

#include <stdio.h>
#include <stdlib.h>

int a, b, c, d, e;

int cmp(const void* a, const void* b){
    return *(int*)a - *(int*)b;
}

int get_c(int x){
    int cnt = 0;
    while(x < d || x > e){
        x = (a * x + b) % c;
        cnt++;
    }
    return cnt;
}

int is_conseq(int a[3]){
    int b[3];
    b[0] = a[0], b[1] = a[1], b[2] = a[2];
    qsort(b, 3, sizeof(int), cmp);
    if(b[1] == b[0] + 1 && b[2] == b[1] + 1) return 1;
    else return 0;
}

int main(){
    scanf("%d %d %d %d %d", &a, &b, &c, &d, &e);
    int record[3] = {-100, -100, -100}, c_num[3] = {-100, -100, -100};
    int found = 0;

    int x;
    while(scanf("%d", &x) != EOF){
        record[0] = record[1], record[1] = record[2];
        c_num[0] = c_num[1], c_num[1] = c_num[2];
        record[2] = x, c_num[2] = get_c(x);
        // printf("%d %d\n", x, get_c(x));
        if(is_conseq(c_num)){
            found = 1;
            printf("%d %d %d\n", record[0], record[1], record[2]);
            break;
        }
    }
    if(!found) printf("Not found\n");
}