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Detect_Capital.cpp

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class Solution {

public:

bool detectCapitalUse(string word) {

int n = (int)word.length();

if(n <= 1) return true;

bool firstUpper = false;

if(isupper(word[0])) {

firstUpper = true;

}

bool allUpper = true, allLower = true;

for(int i = 1; i < n; i++) {

if(isupper(word[i])) {

allLower = false;

} else {

allUpper = false;

}

}

if(!allUpper and !allLower) {

return false;

}

if(firstUpper) {

return true;

}

return allLower;

}

};