c++ - For storage of sparse matrices which is better a vector or a vector for each row different -


i using data structure storing sparse matrices follow. if having matrix follows enter image description here

i using vector of pairs store data. better store these value in single vector this:-

enter image description here

or better store them this:-

enter image description here

i using seperate vector store data starting , end indexes each row.

which of 2 methods use less memory?????

because vector allocates single block of contiguous memory (unlike list), single vector use less memory consolidating heap overhead. assume client interface same regardless (overloading operator[], example), question memory efficency.


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