int longestValidParentheses(string s) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
const char* p = s.c_str();
int max = 0;
int curLen = 0;
while(*p != '\0'){
if(*(p++) == ')'){
if(curLen > max){
max = curLen;
}
curLen = 0;
}else{
const char* p_2 = p;
int tmp =find_valid(p_2);
int tmp2 = p_2-p+1;
if(tmp <(p_2-p+1)){
if(curLen > tmp){
if(curLen > max)
max = curLen;
}
curLen = tmp;
}else{
curLen += tmp;
}
p = p_2;
}
}
if(curLen > max)
max = curLen;
return max;
}
void path::free() {
if (find_valid()) FindClose(hFind);
if (pwfd) {
delete pwfd;
pwfd=NULL;
}
}
list<str> path::files(const str& pattern) {
str old=p;
if (NOT isdir()) p=dirname();
join(pattern);
updated=false;
update();
list<str> fns;
if (find_valid()) {
do {
if (!(pwfd->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
const char* fname=(const char*)pwfd->cFileName;
fns.append(fname);
}
}
while (FindNextFileA(hFind, pwfd));
}
p=old;
updated=false;
return fns;
}
int find_valid(const char* &s){
int curLen = 0;
while(*s != '\0'){
if(*(s++) == ')'){
return curLen+2;
}else{ //*s == '('
const char* s_tmp = s;
int tmp =find_valid(s_tmp);
if(tmp <= s_tmp - s ){
if(curLen < tmp)
curLen = tmp;
s = s_tmp;
return curLen;
}else{
curLen += tmp;
}
s = s_tmp;
}
}
return curLen;
}
const bool path::isdir() {
update();
return find_valid() AND (pwfd->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY);
}
const bool path::exists() {
update();
return find_valid();
}
