ACM International Collegiate Programming Contest, Japan Domestic, 2006, Problem E

gistfile1.c

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

int main(int argc, char *argv[])
{
  FILE *in;
  char stack[100];
  char str[100];
  int n;
  int c;
  int top;
  int bottom;
  int i;
  
  if (argc != 2) {
    fprintf(stderr, "usage: %s file\n", argv[0]);
    exit(1);
  }

  if ((in = fopen(argv[1], "r")) == NULL) {
    fprintf(stderr, "cannot open %s\n", argv[1]);
    exit(1);
  }

  n = 0; top = 0; i = 0;
  while ((c = fgetc(in)) != EOF) {
    if (c >= '0' && c <= '9') {
      n = n * 10 + c - '0';
      continue;
    }
    if (c >= 'A' && c <= 'Z') {
      if (n != 0) {
        stack[top ++] = n;
      }
      str[i ++] = c;
      continue;
    }
    if (c == '(') {
      stack[top ++] = n;
      continue;
    }
    if (c == ')') {
    }
    if (c == '\n') {
      top = 0;
      n = 0;
      continue;
    }
  }
}