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1106.cpp
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1106.cpp
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class Solution {
public:
bool parseBoolExpr(string expression) {
this->s = expression;
int i = 0;
return parseStr(i);
}
string s;
bool parseStr(int& i)
{
if (s[i] == 't')
{
++i;
return true;
}
else if (s[i] == 'f')
{
++i;
return false;
}
else if (s[i] == '&') return parseAnd(i);
else if (s[i] == '|') return parseOr(i);
else return parseNot(i);
}
bool parseAnd(int& i)
{
i += 2;
bool res = parseStr(i);
while (s[i] != ')')
{
i++;
res &= parseStr(i);
}
i++;
return res;
}
bool parseOr(int& i)
{
i += 2;
bool res = parseStr(i);
while (s[i] != ')')
{
i++;
res |= parseStr(i);
}
i++;
return res;
}
bool parseNot(int& i)
{
i += 2;
bool res = !parseStr(i);
i++;
return res;
}
};