Submission #683134

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
683134	2023-01-17 19:35:04	phoenix	Chessboard (IZhO18_chessboard)	C++17	100 / 100	865 ms	3700 KiB

chessboard

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#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
struct point {
    ll x, y;
};
// returns number of black ceils on chess board a x b, f - color of first ceil (0 - white, 1 - black)
ll black_nums(ll a, ll b, bool f) {
    if(a < 0 || b < 0) return 0;
    if(f) return ((a + 1) >> 1) * ((b + 1) >> 1) + (a >> 1) * (b >> 1); 
    return (a >> 1) * ((b + 1) >> 1) + ((a + 1) >> 1) * (b >> 1);
}   
ll func(point p1, point p2, ll d, bool cl) {
    if(p1.x == p2.x && p1.y == p2.y) {
        return (cl ^ ((p1.x / d + p1.y / d) & 1));
    }
    ll cp1y = p1.y / d, cp1x = p1.x / d, cp2x = p2.x / d, cp2y = p2.y / d;
    ll x1 = p1.x, x2 = p2.x, y1 = p1.y, y2 = p2.y;
    ll dx1 = ((d - p1.x % d) % d);
    ll dy1 = ((d - p1.y % d) % d);
    ll dx2 = ((p2.x + 1) % d);
    ll dy2 = ((p2.y + 1) % d);
    if((dx1 || dx2) && cp1x == cp2x) dx1 = p2.x - p1.x + 1, dx2 = 0; 
    x1 += dx1; x2 -= dx2;
    if((dx1 || dx2) && cp1y == cp2y) dy1 = p2.y - p1.y + 1, dy2 = 0; 
    y1 += dy1; y2 -= dy2;
    ll cx1 = x1 / d, cy1 = y1 / d;
 
 
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• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 23 / 23
• Subtask 6: 30 / 30