Parentesi

#include <stdio.h>
#include <assert.h>
#include <bits/stdc++.h>
#include <stack>
using namespace std;

#define MAXN 10000

int controlla(int N, char E[]) {
    int i,j,k;
	char temp;
    stack <char> Con;

    if(N%2==0){
	    for(i=0;i<N;i++){
	    	if(E[i] == '(' || E[i] == '{' || E[i] == '<'|| E[i] == '['){
	    		Con.push(E[i]);
	    	}else if( E[i] == ')' || E[i] == '}' || E[i] == '>' || E[i] == ']' ){
	    		temp=E[i];
	    		if(temp == ')'){
	    			temp--;
	    		}else{
	    			temp=temp-2;
	    		}
	    		if(!Con.empty()){
		    		if(temp==Con.top()){
		    			Con.pop();

		    		}else{
		    			return -1;
		    		}
		    	}else{
	    			return -1;
	    		}
	    	}

	    }
    }else {
    	return -1;
    }
    return 0;
}


char E[MAXN + 5]; // Maggiore di MAXN per contenere newline e null

int main() {
    FILE *fr, *fw;
    int N, i;
    fr = fopen("input.txt", "r");
    fw = fopen("output.txt", "w");
    assert(1 == fscanf(fr, "%d\n", &N));
    assert(fgets(E, MAXN + 5, fr) == E);
    E[N] = 0;

    if (controlla(N, E) < 0)
        fprintf(fw, "malformata\n");
    else
        fprintf(fw, "corretta\n");
    fclose(fr);
    fclose(fw);
    return 0;
}