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Anul 1/Semestrul 2/Data structures/Lab 1/Matrix/Matrix.cpp

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+#include "Matrix.h"
+#include <exception>
+using namespace std;
+
+
+Matrix::Matrix(int nrLines, int nrColumns) {
+	// Theta(1)
+	if (nrLines <= 0 || nrColumns <= 0) {
+		throw exception();
+	}
+	this->numberOfLines = nrLines;
+	this->numberOfColumns = nrColumns;
+	this->values = new TElem[nrLines * nrColumns];
+	this->lines = new int[nrLines * nrColumns];
+	this->columns = new int[nrColumns+1];
+	for (int i = 0; i < nrColumns+1; i++) {
+		this->columns[i] = 0;
+	}
+	   
+}
+
+
+int Matrix::nrLines() const {
+	// Theta(1)
+	return this->numberOfLines;
+}
+
+
+int Matrix::nrColumns() const {
+	// Theta(1)
+	return this->numberOfColumns;
+}
+
+
+TElem Matrix::element(int i, int j) const {
+	// Best: theta(1) | Worst: theta( nr of non-zero elements in the column) | Total: theta( nr of non-zero elements in the column)
+
+	if(i>=this->numberOfLines || j>=this->numberOfColumns || i<0 || j<0)
+		throw exception();
+	
+	for(int k=0;k<this->columns[j+1]-this->columns[j];k++){
+		if(this->lines[k+this->columns[j]]==i)
+			return this->values[k+this->columns[j]];
+	}
+	return NULL_TELEM;
+}
+
+TElem Matrix::modify(int i, int j, TElem e) {
+	// Best: theta(1) | Worst: theta( nr of rows + nr of non zero values + nr of non zero values in the column) | Total: theta( nr of rows + nr of non zero values + nr of non zero values in the column)
+
+	if(i>=this->numberOfLines || j>=this->numberOfColumns  || i<0 || j<0)
+		throw exception();
+	
+	for(int k=0;k<this->columns[j+1]-this->columns[j];k++){
+		if(this->lines[k+this->columns[j]]==i){
+			swap(this->values[k+this->columns[j]],e);
+			return e;
+		}
+	}
+	for(int k=this->columns[this->numberOfColumns];k>this->columns[j];k--){
+		swap(this->lines[k],this->lines[k-1]);
+		swap(this->values[k],this->values[k-1]);
+	}
+	this->lines[this->columns[j]]=i;
+	this->values[this->columns[j]]=e;
+	for(int k=j+1;k<=this->numberOfColumns;k++)
+		this->columns[k]++;
+	return NULL_TELEM;
+}
+
+void Matrix::setMainDiagonal(TElem e) {
+	// Theta(min(nr of rows,nr of cols))
+	int length = this->numberOfLines;
+	if (this->numberOfColumns < this->numberOfLines) {
+		length = this->numberOfColumns;
+	}
+	for (int i = 0; i < length; i++) {
+		this->modify(i, i, e);
+	}
+}
+