bool trans(int l, int r, strArray &a)
{
int i = l, ope = 1, j;
strArray b, c, d;
string s;
a.clear();
if (l > r) {
a.push_back("");
return 1;
};
while (i <= r)
{
if (st[i] == '+')
{
if (ope) return 0;
ope = 1; ++i;
}
else {
if (!ope || (st[i] < 'a' || st[i] > 'z') && st[i] != '(') return 0;
b.clear(); b.push_back("");
while (i <= r && (st[i] >= 'a' && st[i] <= 'z' || st[i] == '('))
{
if (st[i] == '(')
{
if (!findEnd(i, j, r)) return 0;
if (!trans(i + 1, j - 1, c)) return 0;
i = j + 1;
}
else {
s = "";
while (i <= r && st[i] >= 'a' && st[i] <= 'z') s += st[i ++];
c.clear(); c.push_back(s);
};
if (c.empty()) return 0;
mult(b, c);
};
if (b.size() == 1 && b[0] == "") continue;
add(a, b); ope = 0;
};
};
if (ope && !a.empty()) return 0;
return 1;
};
