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60 changes: 60 additions & 0 deletions
...458.Select-K-Disjoint-Special-Substrings/3458.Select-K-Disjoint-Special-Substrings_v2.cpp
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| class Solution { | ||
| public: | ||
| bool maxSubstringLength(string s, int k) | ||
| { | ||
| int n = s.size(); | ||
| vector<vector<int>>pos(26); | ||
| for (int i=0; i<n; i++) | ||
| pos[s[i]-'a'].push_back(i); | ||
|
|
||
| vector<pair<int, int>>intervals; | ||
| for (int letter=0; letter<26; letter++) | ||
| { | ||
| if (pos[letter].empty()) continue; | ||
| int start = pos[letter][0]; | ||
| int i = start; | ||
| int far = pos[letter].back(); | ||
|
|
||
| bool flag = true; | ||
| while (i<=far) | ||
| { | ||
| far = max(far, pos[s[i]-'a'].back()); | ||
| if (pos[s[i]-'a'][0]<start) | ||
| { | ||
| flag = false; | ||
| break; | ||
| } | ||
| i++; | ||
| } | ||
| if (far-start+1==n) continue; | ||
| if (flag==false) continue; | ||
| intervals.push_back({start, far}); | ||
| } | ||
|
|
||
| return helper(intervals)>=k; | ||
| } | ||
|
|
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| bool contains(pair<int,int>a, pair<int,int>b) | ||
| { | ||
| return a.first<b.first && a.second>b.second; | ||
| } | ||
|
|
||
| int helper(vector<pair<int, int>> &intervals) { | ||
| int n = intervals.size(); | ||
| vector<int>check(n, 1); | ||
| for (int i=0; i<n; i++) | ||
| for (int j=0; j<n; j++) | ||
| { | ||
| if (i==j) continue; | ||
| if (contains(intervals[i],intervals[j])) | ||
| check[i] = 0; | ||
| if (contains(intervals[j],intervals[i])) | ||
| check[j] = 0; | ||
| } | ||
| int ret = 0; | ||
| for (int i=0; i<n; i++) ret += check[i]; | ||
| return ret; | ||
| } | ||
|
|
||
|
|
||
| }; |
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