|
| 1 | +function isValid(s) { |
| 2 | + var freq={}; |
| 3 | + var uniqueFreq = new Set(); |
| 4 | + for(var i=0; i<s.length; i++){ |
| 5 | + if(freq[s.charAt(i)]){ |
| 6 | + freq[s.charAt(i)]++; |
| 7 | + }else{ |
| 8 | + freq[s.charAt(i)] = 1; |
| 9 | + } |
| 10 | + } |
| 11 | + for(var prop in freq){ |
| 12 | + uniqueFreq.add(freq[prop]); |
| 13 | + } |
| 14 | + if(uniqueFreq.size!==1 && uniqueFreq.size!==2){ |
| 15 | + return 'NO'; |
| 16 | + } |
| 17 | + if(uniqueFreq.size === 1){ |
| 18 | + return 'YES'; |
| 19 | + } |
| 20 | + if(uniqueFreq.size === 2){ |
| 21 | + var uniqueFreqArr = []; |
| 22 | + uniqueFreq.forEach (function(val) { |
| 23 | + uniqueFreqArr.push(val); |
| 24 | + }); |
| 25 | + var higherFreqVal = uniqueFreqArr[1]; |
| 26 | + var lowerFreqVal = uniqueFreqArr[0]; |
| 27 | + if(uniqueFreqArr[0]>uniqueFreqArr[1]){ |
| 28 | + higherFreqVal = uniqueFreqArr[0]; |
| 29 | + lowerFreqVal = uniqueFreqArr[1]; |
| 30 | + } |
| 31 | + var noCharHigherFreq = 0; |
| 32 | + var noCharLowerFreq = 0; |
| 33 | + for(var letter in freq){ |
| 34 | + if(freq[letter]===higherFreqVal){ |
| 35 | + noCharHigherFreq++; |
| 36 | + } |
| 37 | + if(freq[letter]===lowerFreqVal){ |
| 38 | + noCharLowerFreq++; |
| 39 | + } |
| 40 | + } |
| 41 | + if((lowerFreqVal===1&&noCharLowerFreq===1)||((Math.abs(uniqueFreqArr[0]-uniqueFreqArr[1]) === 1)&&noCharHigherFreq===1)){ |
| 42 | + return 'YES' |
| 43 | + }else{ |
| 44 | + return 'NO'; |
| 45 | + } |
| 46 | + } |
| 47 | +} |
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