UVa 498 - Polly the Polynomial

#include <stdio.h>

int main() {
  char s[10000];
  while (gets(s) != NULL) {
    int i, j, l, n = 0, times = 0, cal = 0, c[10000];
    for (l = 0; ; l++) {
      if (s[l] == ' ' || !s[l]) {
        if (n) cal *= -1;
        c[times++] = cal;
        n = 0;
        cal = 0;
        if (!s[l]) break;
      } else if (s[l] == '-') {
        n = 1;
      } else {
        cal = cal * 10 + s[l] - '0';
      }
    }
    gets(s);
    int x = 0, first = 0, sum = 0, temp;
    for (l = 0; ; l++) {
      if (s[l] == ' ' || !s[l]) {
        if (first) printf(" ");
        first = 1;
        if (n) x *= -1;
        sum = 0;
        for (i = 0; i < times; i++) {
          temp = c[i];
          for (j = 0; j < (times - 1 - i); j++)
            temp *= x;
          sum += temp;
        }
        printf("%d", sum);
        x = 0;
        n = 0;
        if (!s[l]) break;
      } else if (s[l] == '-') {
        n = 1;
      } else {
        x = x * 10 + s[l] - '0';
      }
    }
    puts("");
  }
  return 0;
}