int W[12]={6, 2, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
int y, m, d, w;
scanf("%d %d %d",&y, &m, &d);
w=W[m-1]+y+(y/4)-(y/100)+(y/400);
if( ((y%4)==0) && (m<3) ) {
w--;
if((y%100)==0) w++;
if((y%400)==0) w--;
}
printf("%d\n", (w+d)%7);
Hacker's Delight
A collection useful programming advice the author has collected over the years; small algorithms that make the programmer's task easier.
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Line drawing algorithm - Wikipedia, the free encyclopedia
A line drawing algorithm is a graphical algorithm for approximating a line segment on discrete graphical media. On discrete media, such as pixel-based displays and printers, line drawing requires such an approximation (in nontrivial cases).
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In computer graphics, the midpoint circle algorithm is an algorithm used to determine the points needed for drawing a circle. The algorithm is a variant of Bresenham's line algorithm, although not invented by Bresenham. The algorithm is therefore also sometimes referred to as Bresenham's circle algorithm.
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Bresenham's line algorithm - Wikipedia, the free encyclopedia
The Bresenham line algorithm is an algorithm that determines which points in an n-dimensional raster should be plotted in order to form a close approximation to a straight line between two given points. It is commonly used to draw lines on a computer screen, as it uses only integer addition, subtraction and bit shifting all of which are very cheap operations in standard computer architectures. It is one of the earliest algorithms developed in the field of computer graphics.
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