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10.cpp
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63 lines (60 loc) · 1.89 KB
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#include<iostream>
#include<vector>
#include<map>
#include<string>
using namespace std;
bool check(const string& s, const string& p, int i, int j) {
if(i == s.length() && j == p.length())
return true;
else if(i != s.length() && j == p.length()) {
return false;
}
while( i < s.length() && j < p.length() ) {
if(p[j] == '.'&& !(j+1 < p.length() && p[j+1] == '*') ) {
++i;
++j;
} else if (p[j] == '.'&& j+1 < p.length() && p[j+1] == '*') {
return check(s, p, i+1, j) || check(s, p, i, j+2);
} else if (p[j] == '*') {
return false;
} else if(p[j] == s[i] && !(j+1 < p.length() && p[j+1] == '*') ) {
return check(s, p, i+1, j+1);
} else if( p[j] == s[i] &&j+1 < p.length() && p[j+1] == '*') {
return check(s, p, i+1, j) || check(s, p, i, j+2);
} else if(p[j] != s[i] && !(j+1 < p.length() && p[j+1] == '*') ) {
return false;
} else if( p[j] != s[i] &&j+1 < p.length() && p[j+1] == '*') {
return check(s, p, i, j+2);
} else {
return false;
}
}
if(i == s.length() && j == p.length())
return true;
else if(i != s.length() && j == p.length()) {
return false;
} else if(j+1 < p.length() && p[j+1] == '*') {
return check(s, p, i, j+2);
} else
return false;
}
bool isMatch(string s, string p) {
if(p.empty() && s.empty())
return true;
else if(p.empty() && !s.empty())
return false;
else
return check(s, p, 0, 0);
}
int main(){
/*
cout<<isMatch("aa","a")<<endl;
cout<< isMatch("aa","aa") <<endl;
cout<< isMatch("aaa","aa")<<endl;
cout<< isMatch("aa", "a*")<<endl;
cout<< isMatch("aa", ".*")<<endl;
cout<< isMatch("ab", ".*")<<endl;
*/
cout<< isMatch("aab", "c*a*b") <<endl;
return 1;
}