s7 edge length

. Set the longest edge of the triangle to X, (other y,z) a maximum of C (x) triangles So Y+z>x X-y So when Y=1 is misunderstood 0 y=2 a solution y=3 three solutions ..... 0+1+2+3+....+ (x-2) Total: (x-2) * (x-1)/2 But this is where the y=z is calculated and two times per triangle. (Y=z situation) y=x/2+1 start (x-1)-(x/2+1) +1=x/2-1 not difficult to find X for odd case is X/2 even case is x/2-1 so→ (tip) (X-1)/2

Original address: http://lixing123.com/?p=280Dijkstra algorithm (This Dutch word is really hard to read ...) But Dijkstra is a very NB computer scientist, goto harmful theory, signal volume and PV primitive, philosopher dinner problem, banker algorithm, etc., is this Daniel made out, is the forward/non-weighted graph (that is, each side has a length), the calculation of the shortest distance between two points of the effective method, In the case of h

Definitions and usageIs_infinite () Determines whether it is an infinite value. GrammarIs_infinite (x) parameter descriptionX required. Specify the value to check. DescriptionReturns True if X is infinitely large (positive or negative), such as the result of log (0) or any value that exceeds the range of floating-point numbers on this platform function is_w_x_z ($number)//Custom Function Extended judgment { if (Is_infinite ($number))//The value is judged { echo $number. " is

Definition and usageIs_infinite () determines whether it is an infinite value. SyntaxIs_infinite (x) parameter descriptionX is required. Specifies the value to be checked. DescriptionIf x is infinite (positive or negative), for example, log (0) results or any value beyond the floating point range of the platform, true is returned. Function is_w_x_z ($ number) // customize the function Extension judgment function { If (is_infinite ($ number) // determines the value. { Echo $ number. "is a

DescribeGiven the length of the three segments, determine if the three segments can form a triangle. If it is able to make up, calculate its area.The input input has only one row and contains three floating-point numbers, each representing the edge length of the triangle's three sides, separated by a space between the number and the number. Outputs the area of th

#include #include#include#definePi ACOs (-1)structpoint{Doublex, y;} First,last,now;DoubleDiststructPoint *a,structPoint *b) { returnsqrt ((a->x-b->x) * (a->x-b->x) + (a->y-b->y) * (a->y-b->y));}intMain () {intN,i; Doubleans=0.0, R; scanf ("%d%lf",n,R); Ans+=2*pi*R; scanf ("%LF%LF",first.x,first.y); Last=First ; for(i=1; i) {scanf ("%LF%LF",now.x,now.y); Ans+=dist (last,Now ); Last=Now ; } ans+=dist (first,Last ); printf ("%.2f\n", ans); return 0;}View Codestoring x, y coordinates of a point