What is the meaning of DONE keyword?

#1

int x=0, DONE;
// What does this signify

#2

hi @devesh20500, DONE is defined as DONE = ((1<<n) - 1); which evaluates to 11111… (n times) . since rowmask denote which position (columns) in all rows are filled.thus rowmask == DONE denotes that all column has one queen in a valid position
here’s the code from the vedio : http://ide.codingblocks.com/s/281

#3

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