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Pascal's Triangle.cpp
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Pascal's Triangle.cpp
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// Runtime: 0 ms, faster than 100.00% of C++ online submissions for Pascal's Triangle.
// Memory Usage: 7.1 MB, less than 20.26% of C++ online submissions for Pascal's Triangle.
class Solution {
public:
vector<vector<int>> ans;
vector<vector<int>> generate(int numRows){
vector<int> prev,curr;
curr.push_back(1);
prev.push_back(1);
prev.push_back(1);
if(numRows == 0){
return ans;
}
else if(numRows == 1){
ans.push_back(curr);
return ans;
}
else if(numRows == 2){
ans.push_back(curr);
ans.push_back(prev);
return ans;
}
else{
ans.push_back(curr);
ans.push_back(prev);
int i=3;
while(i<=numRows){
curr.clear();
curr.push_back(1);
for(int j=0;j<prev.size()-1;j++){
curr.push_back(prev[j]+prev[j+1]);
}
curr.push_back(1);
prev=curr;
i++;
ans.push_back(curr);
}
return ans;
}
}
};