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20.valid-parentheses.c
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20.valid-parentheses.c
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/*
* @lc app=leetcode id=20 lang=c
*
* [20] Valid Parentheses
*/
// @lc code=start
bool isValid(char * s){
int i=0,j=-1;
char *t=malloc(strlen(s)+1);
memset(t,0,strlen(s)+1);
for (i=0;i<strlen(s);i++) {
switch(s[i])
{
case '(':
case '[':
case '{':
j++;
t[j]=s[i];
break;
case ')':
if (j<0 || t[j]!='(') {
return false;
} else {
j--;
}
break;
case ']':
if (j<0 || t[j]!='[') {
return false;
} else {
j--;
}
break;
case '}':
if (j<0 || t[j]!='{') {
return false;
} else {
j--;
}
break;
default:
break;
}
}
if (j==-1) {
return true;
} else {
return false;
}
}
// @lc code=end