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LeetCode-Solutions/C++/valid-parenthesis-string.cpp at master · pythonpeixun/LeetCode-Solutions · GitHub
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C++
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valid-parenthesis-string.cpp
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C++
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valid-parenthesis-string.cpp
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//
Time: O(n)
//
Space: O(1)
class
Solution
{
public:
bool
checkValidString
(string s) {
int
lower =
0
, upper =
0
;
//
keep lower bound and upper bound of '(' counts
for
(
const
auto
& c : s) {
lower += (c ==
'
(
'
) ?
1
: -
1
;
upper -= (c ==
'
)
'
) ?
1
: -
1
;
if
(upper <
0
)
break
;
lower =
max
(lower,
0
);
}
return
lower ==
0
;
//
range of '(' count is valid
}
};
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