Register int [Reserved] use

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This link: https://blog.csdn.net/Liukairui/article/details/81115041

 

 

Today saw a piece of code so

void floyd(){
    for(register int a=1;a<=v;a++){
        for(register int b=1;b<=v;b++){
            for(register int c=1;c<=v;c++){
                if(G[b][a]+G[a][c]<G[b][c])G[b][c]=G[b][a]+G[a][c];
            }
        }
    }
    return;
}

 

 

This register intis indication register cpu internal registers (registers are part of the central processor registers is limited storage capacity high-speed storage means) variable, and int is the usual variable in memory, into the register can accelerate the write speed of the variable
which is a cyclic code in use 1e8 int used

if register int

Note that in general circulation in the multilayer