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1198. Find Smallest Common Element in All Rows

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	`1`	`+// Runtime: 148 ms`
	`2`	`+// Memory Usage: 28 MB`
	`3`	`+class Solution {`
	`4`	`+public:`
	`5`	`+ int smallestCommonElement(vector<vector<int>>& mat) {`
	`6`	`+ map<int, int> mp;`
	`7`	`+ for (auto A : mat) {`
	`8`	`+ for (int a : A) {`
	`9`	`+ mp[a]++;`
	`10`	`+ }`
	`11`	`+ }`
	`12`	`+ for (auto a : mp) {`
	`13`	`+ if (a.second == mat.size()) {`
	`14`	`+ return a.first;`
	`15`	`+ }`
	`16`	`+ }`
	`17`	`+ return -1;`
	`18`	`+ }`
	`19`	`+};`

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