#include <iostream>
#include <string.h>

using namespace std;

int op (char a){
    char oper[] = {'+', '-','*', '/', '(', ')'};
    for (int i = 0; i < 6; i++)
        if (a == oper[i])
            return i;

    return 0;
}
//((x+0))*(3*x)-x*(x-5)
char* delete_scobe(char* str, char x){
    char res[100]="";
    bool used[100]={false};
    int prior, k=0,sc=0;

    for (int i = 0; i < strlen(str); i++){
        if(str[i] == 'x'){
            res[k] = str[i];
            k++;
            continue;
        }
        if ((int)str[i] - 48  >= 0){
            res[k] = str[i];
            k++;
            continue;
        }
        if (str[i] == '('){
            sc++;
            for (int j=i+1; j < strlen(str); j++){
                if (op(str[j]) <= 1){
                    if (str[j] != 'x' && ((int)str[j] - 48 < 0 || (int)str[j] - 48 > 9) && !used[j]){
                        if (i == 0){
                            sc--;
                            break;
                        }
                        used[j]=true;
                        res[k]=str[i];
                        k++;
                        break;
                    }
                }else if (str[j] == ')'){
                    sc--;
                    break;
                }
                if (str[j] =='*' || str[j] == '/'){
                    j=strlen(str);
                    if (sc > 0)
                        sc--;
                }
            }
            continue;
        }
        if (str[i] == ')' && sc > 0){
            sc--;
            res[k]=str[i];
            k++;
            continue;
        }else{
            if (str[i] == ')' && !sc)
                continue;
            res[k]=str[i];
            k++;
            continue;
        }
    }

    for (int i=0; i < strlen(res); i++)
        if (res[i] == 'x')
            res[i] = x;
    return res;
}

int main(){
    char *str = "((x*5)+(x*3*(x-5)))-4*(x*5)";
    char x = '5';
    //cin >> str;
    //cin >> x;

    str = delete_scobe(str, x);

    return 0;
}