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Considerable Optimization in Page 193, Chapter 7 (ch7/queen2.cpp) #57

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shuzhouliu opened this issue Jul 31, 2021 · 0 comments
Open

Considerable Optimization in Page 193, Chapter 7 (ch7/queen2.cpp) #57

shuzhouliu opened this issue Jul 31, 2021 · 0 comments

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@shuzhouliu
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if (!vis[0][i] && !vis[1][cur+i] && !vis[2][cur-i+n]

can be optimized to

if (!vis[0][i] && !vis[1][cur+i-n] && !vis[2][cur-i+n]

in prevention in memory abuse.
e.g. cur+i maybe is bigger than the limit for N Queen Problem. Maybe subtract an n on that expression.
@shuzhouliu shuzhouliu changed the title Considerable Optimize in Page 193, Chapter 7 (ch7/queen2.cpp) Considerable Optimization in Page 193, Chapter 7 (ch7/queen2.cpp) Aug 1, 2021
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