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1232. Check If It Is a Straight Line

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	`1`	`+// Runtime: 12 ms`
	`2`	`+// Memory Usage: 10.3 MB`
	`3`	`+class Solution {`
	`4`	`+public:`
	`5`	`+`
	`6`	`+ float slope(vector<vector<int> > &coordinates, int i, int j) {`
	`7`	`+ return (float)(coordinates[j][1] - coordinates[i][1]) / (float)(coordinates[j][0] - coordinates[i][0]);`
	`8`	`+ }`
	`9`	`+`
	`10`	`+ bool checkStraightLine(vector<vector<int>>& coordinates) {`
	`11`	`+ float slp = slope(coordinates, 0, 1);`
	`12`	`+`
	`13`	`+ for (int i = 1; i < coordinates.size() - 1; i++) {`
	`14`	`+ if (slp != slope(coordinates, i, i + 1)) {`
	`15`	`+ return false;`
	`16`	`+ }`
	`17`	`+ }`
	`18`	`+ return true;`
	`19`	`+`
	`20`	`+ }`
	`21`	`+};`

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