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Possible Duplicates:
Using arrays or std::vectors in C++, what's the performance gap?
std::vector is so much slower than plain arrays?

memory is vector of 1000 elements array[] is an integer array of 1000 elements

for (iteration = 0; iteration < numiterations; iteration++) { for (j = 1; j < numints; j++) { memory[j] += memory[j - 1]; //array[j] += array[j - 1]; } } 

If I compare the time of the for loop after running 100 iterations, time required for accessing is very much small compared to that of vector

why is the case ? because I thought both takes constant and nearly same time ..

Possible Duplicates:
Using arrays or std::vectors in C++, what's the performance gap?
std::vector is so much slower than plain arrays?

memory is vector of 1000 elements array[] is an integer array of 1000 elements

for (iteration = 0; iteration < numiterations; iteration++) { for (j = 1; j < numints; j++) { memory[j] += memory[j - 1]; //array[j] += array[j - 1]; } } 

If I compare the time of the for loop after running 100 iterations, time required for accessing is very much small compared to that of vector

why is the case ? because I thought both takes constant and nearly same time ..

memory is vector of 1000 elements array[] is an integer array of 1000 elements

for (iteration = 0; iteration < numiterations; iteration++) { for (j = 1; j < numints; j++) { memory[j] += memory[j - 1]; //array[j] += array[j - 1]; } } 

If I compare the time of the for loop after running 100 iterations, time required for accessing is very much small compared to that of vector

why is the case ? because I thought both takes constant and nearly same time ..

Possible Duplicates:
Using arrays or std::vectors in C++, what's the performance gap?
std::vector is so much slower than plain arrays?

memory is vector of 1000 elements array[] is an integer array of 1000 elements

for (iteration = 0; iteration < numiterations; iteration++) { for (j = 1; j < numints; j++) { memory[j] += memory[j - 1]; //array[j] += array[j - 1]; } } 

If I compare the time of the for loop after running 100 iterations, time required for accessing is very much small compared to that of vector

why is the case ? because I thought both takes constant and nearly same time ..