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1232.cpp
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1232.cpp
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__________________________________________________________________________________________________
sample 0 ms submission
class Solution {
public:
bool checkStraightLine(vector<vector<int>>& cs) {
if (cs.size() == 2) return true;
int x = cs[0][0];
int y = cs[0][1];
int n = cs[1][0] - x;
int d = cs[1][1] - y;
for (int i = 2; i < cs.size(); ++i) {
int curX = cs[i][0] - x;
int curY = cs[i][1] - y;
if (curX * d != curY * n) return false;
}
return true;
}
};
__________________________________________________________________________________________________
sample 4 ms submission
class Solution {
public:
Solution(){
ios::sync_with_stdio(false);
std::cin.tie(nullptr);
std::cout.tie(nullptr);
}
bool checkStraightLine(vector<vector<int>>& coordinates) {
int size = coordinates.size();
if(size <= 2) return true;
int x0 = coordinates[0][0] - coordinates[1][0];
int y0 = coordinates[0][1] - coordinates[1][1];
for(int i=2; i<size; ++i){
int x = coordinates[i][0] - coordinates[1][0];
int y = coordinates[i][1] - coordinates[1][1];
if(x0*y - y0*x != 0) return false;
}
return true;
}
};
__________________________________________________________________________________________________
sample 8 ms submission
class Solution {
public:
bool checkStraightLine(vector<vector<int>>& A) {
int n=A.size();
double initial=100000.0;
for(int i=1;i<n;i++)
{
int x = A[i][0]-A[i-1][0];
int y =A[i][1]- A[i-1][1];
if(y==0)
{
initial=100000.0;
continue;
}
double slope = (double) x/y;
if(initial==100000.0)
initial=slope;
else if(initial!=slope)
return false;
}
return true;
}
};