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Add C++ solution of problem #2379

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	`1`	`+// sliding window`
	`2`	`+`
	`3`	`+class Solution {`
	`4`	`+public:`
	`5`	`+ int minimumRecolors(string s, int k) {`
	`6`	`+ int ans = INT_MAX;`
	`7`	`+ int tmp = 0; // store # white blocks`
	`8`	`+ auto isWhite = [&](int idx) -> bool {`
	`9`	`+ return s[idx] == 'W';`
	`10`	`+ };`
	`11`	`+`
	`12`	`+ for(int i = 0; i < k; i++)`
	`13`	`+ tmp += isWhite(i);`
	`14`	`+ ans = min(ans, tmp);`
	`15`	`+`
	`16`	`+ int n = s.size();`
	`17`	`+ for(int i = 1; i < n - k + 1; i++) {`
	`18`	`+ tmp -= isWhite(i - 1);`
	`19`	`+ tmp += isWhite(i + k - 1);`
	`20`	`+ ans = min(ans, tmp);`
	`21`	`+ }`
	`22`	`+`
	`23`	`+ return ans;`
	`24`	`+ }`
	`25`	`+};`

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