Bug Fixed: tsub-ok.c

[vamirio98]

When x is negative and y = INT_MIN there is not a overflow, but the function tsub_ok() returns 0 (also see #59). So I try to fix it.

[iXanadu13]

int tsub_ok(int x,int y){
    return !(x>0&&y<0&&x-y<=0 || x<0&&y>0&&x-y>=0);
}

Maybe this is also a possible solution?

[paradox181]

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