94 lines
1.6 KiB
C
94 lines
1.6 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#define SIZE 100
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int parenToInt(char ch) {
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if (ch == '(') {
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return 0;
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} else if (ch == ')') {
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return 1;
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} else if (ch == '[') {
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return 2;
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} else if (ch == ']') {
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return 3;
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} else if (ch == '{') {
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return 4;
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} else if (ch == '}') {
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return 5;
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} else {
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return -1;
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}
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}
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typedef struct stack {
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int top;
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int capacity;
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int *array;
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} stack;
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stack *newStack(int capacity) {
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stack *st = malloc(sizeof(stack));
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st->capacity = 50;
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st->top = -1;
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st->array = malloc(st->capacity * sizeof(int));
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return st;
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}
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void push(stack *st, int val) {
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st->top++;
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st->array[st->top] = val;
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}
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int peek(stack *st) { return st->array[st->top]; }
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void pop(stack *st) { st->top--; }
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int isEmpty(stack *st) { return (st->top == -1); }
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int main(void) {
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char input[SIZE];
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fgets(input, SIZE, stdin);
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int num;
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int ans[3] = {};
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stack *st = newStack(SIZE);
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for (int i = 0; input[i] != '\0'; i++) {
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num = parenToInt(input[i]);
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if (num != -1) {
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if (num % 2 == 0) {
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// left paren , push to stack
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push(st, num);
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} else {
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// right paren
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if (!isEmpty(st) && peek(st) == num - 1) {
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pop(st);
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} else {
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// a error
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ans[num / 2] = 1;
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}
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}
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}
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}
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while (!isEmpty(st)) {
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num = peek(st);
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ans[num / 2] = 1;
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pop(st);
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}
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int incorrect = ans[0] | ans[1] | ans[2];
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if (incorrect) {
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for (int i = 0; i < 3; i++) {
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if (ans[i]) {
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printf("%d,", i + 1);
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}
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}
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} else {
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printf("0");
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}
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return 0;
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}
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