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{﹣2,1} {﹣2,0} {0,2} {0,1}
5 13 25
[0,2] [-2,0] (-∞,2] [-2,+∞)
if(ex1)ex2;else ex3; if(ex2)ex1;else ex3; if(ex1)ex3;else ex2; if(ex3)ex2;else ex1;
if (ex1) ex2;else ex3; if (ex2) ex1;else ex3; if (ex2) ex3;else ex2; if (ex3) ex2;else ex1;
if(ex2) ex1; else ex3; if(ex3) ex2; else ex1; if(ex1) ex3; else ex2; if(ex1) ex2; else ex3;
{-1,0,4} {-1,0} {0,4} {-2,-1,0}
if(ex2)
ex1;
else
ex3; if(ex3)
ex2;
else
ex1; if(ex1)
ex3;
else
ex2; if(ex1)
ex2;
else
ex3;
3 4 2
if (ex1) ex2;else ex3;
if (ex2) ex1;else ex3;
if (ex2) ex3;else ex2; if (ex3) ex2;else ex1;
1 2