BUPT-homework/semester1/pset12/2-1-paren.c

// https://bbc3502.hopto.org/c2021/index.php/home-17/591-1
// This code should get 100 points but due to the shitty pintia, it gets 90.
#include <stdio.h>
#include <string.h>
#define MAXLEN 101

int main(void) {
  char str[MAXLEN];
  // fgets is not gets
  fgets(str, MAXLEN, stdin);

  // Process string
  int count = 0;
  int mismatch = 0;
  for (int i = 0, n = strlen(str); i < n && !mismatch; i++) {
    if (str[i] == '(') {
      if (count < 0) { // )(
        mismatch = 1;
      } else {
        count++;
      }
    } else if (str[i] == ')') {
      count--;
    }
  }

  // Validate
  if (count != 0) {
    printf("parentheses do not match!\n");
  } else {
    printf("parentheses match!\n");
  }
  return 0;
}