diff options
| author | mzuenni <michi.zuendorf@gmail.com> | 2022-06-27 17:19:28 +0200 |
|---|---|---|
| committer | mzuenni <michi.zuendorf@gmail.com> | 2022-06-27 17:19:28 +0200 |
| commit | 5ab8a5088b729a9953b8dff1b2a985dc8fb2098b (patch) | |
| tree | ed40d6936c0e9eee40ba62751cbf99ecddbaddc2 /datastructures/segmentTree2D.cpp | |
| parent | adabbad9c51cf7cd3874bfde8eac1fbcf84fec10 (diff) | |
updated tcr
Diffstat (limited to 'datastructures/segmentTree2D.cpp')
| -rw-r--r-- | datastructures/segmentTree2D.cpp | 58 |
1 files changed, 0 insertions, 58 deletions
diff --git a/datastructures/segmentTree2D.cpp b/datastructures/segmentTree2D.cpp deleted file mode 100644 index a9d129b..0000000 --- a/datastructures/segmentTree2D.cpp +++ /dev/null @@ -1,58 +0,0 @@ -// 1-indiziert. Array t: [4*n][4*m]. Nur die _x-Varianten aufrufen. -// Laufzeit: build: O(n*m), update, sum: O(log(n)*log(m)) -void build_y(int vx, int lx, int rx, int vy, int ly, int ry) { - if (ly == ry) { - if (lx == rx)vt[vx][vy] = a[lx][ly]; - else t[vx][vy] = t[vx*2][vy] + t[vx*2+1][vy]; - } else { - int my = (ly + ry) / 2; - build_y(vx, lx, rx, vy*2, ly, my); - build_y(vx, lx, rx, vy*2+1, my+1, ry); - t[vx][vy] = t[vx][vy*2] + t[vx][vy*2+1]; -}} - -void build_x(int vx = 1, int lx = 0, int rx = N-1) { - if (lx != rx) { - int mx = (lx + rx) / 2; - build_x(vx*2, lx, mx); - build_x(vx*2+1, mx+1, rx); - } - build_y(vx, lx, rx, 1, 0, m-1); -} - -int sum_y(int vx, int vy, int tly, int try_, int ly, int ry) { - if (ly > ry) return 0; - if (ly == tly && try_ == ry) return t[vx][vy]; - int tmy = (tly + try_) / 2; - return sum_y(vx, vy*2, tly, tmy, ly, min(ry,tmy)) - + sum_y(vx, vy*2+1, tmy+1, try_, max(ly,tmy+1), ry); -} - -int sum_x(int vx=1, int tlx=0, int trx=n-1,int lx,int rx,int ly,int ry) { - if (lx > rx) return 0; - if (lx == tlx && trx == rx) return sum_y(vx, 1, 0, m-1, ly, ry); - int tmx = (tlx + trx) / 2; - return sum_x(vx*2, tlx, tmx, lx, min(rx,tmx), ly, ry) - + sum_x(vx*2+1, tmx+1, trx, max(lx,tmx+1), rx, ly, ry); -} - -void update_y(int vx, int lx, int rx, int vy, int ly, int ry, - int x, int y, int new_val) { - if (ly == ry) { - if (lx == rx) t[vx][vy] = new_val; - else t[vx][vy] = t[vx*2][vy] + t[vx*2+1][vy]; - } else { - int my = (ly + ry) / 2; - if (y <= my) update_y(vx, lx, rx, vy*2, ly, my, x, y, new_val); - else update_y(vx, lx, rx, vy*2+1, my+1, ry, x, y, new_val); - t[vx][vy] = t[vx][vy*2] + t[vx][vy*2+1]; -}} - -void update_x(int vx=1, int lx=0, int rx=n-1, int x, int y, int new_val) { - if (lx != rx) { - int mx = (lx + rx) / 2; - if (x <= mx) update_x(vx*2, lx, mx, x, y, new_val); - else update_x(vx*2+1, mx+1, rx, x, y, new_val); - } - update_y(vx, lx, rx, 1, 0, m-1, x, y, new_val); -} |
