60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
#include <string.h>
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#include "lib.h"
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void resetArray(int* count) {
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int length = '~' - 32 + 1;
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for (int i=0; i<length; i++) {
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count[i] = 0;
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}
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}
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int lengthOfLongestSubstring(char * s) {
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// Create an array to count every symbol
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// '~' is one of the last symbols in ascii table (except DEL)
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int count['~' - 32 + 1];
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resetArray(count);
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int len = strlen(s);
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// Start of the current sequence
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int start = 0;
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// Result will be stored here
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int maxlen = 0;
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while (start < len) {
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// End of the current sequence
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int end = start;
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while (end < len) {
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// Calculate index in array
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int ch = s[end] - 32;
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// Symbol repeated
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if (count[ch] == 1) {
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// Fill array with 0
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resetArray(count);
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// Save max length
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int newmaxlen = end - start;
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if (newmaxlen > maxlen)
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maxlen = newmaxlen;
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// Move to the next sequence
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start++;
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end = start;
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}
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else {
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// Save the symbol
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count[ch]++;
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// Move to the next symbol
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end++;
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}
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}
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// Save max length
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int newmaxlen = end - start;
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if (newmaxlen > maxlen)
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maxlen = newmaxlen;
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// Move to the next sequence
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start++;
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end = start;
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}
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return maxlen;
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}
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