Codeforces 610D Vika and Segments

Source: Internet
Author: User

Http://codeforces.com/problemset/problem/610/D

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Although it's a line segment, it's not considered so much if you write a rectangular area and write the rectangle directly.

But here's an extra explanation for the rectangular area and the line tree.

Note that a certain \$-1 \$ must be in this section \$ +1 \$ before the action will occur

So the mark is the number of times that this section has been "fully" overwritten and is not labeled as part of the modification

This is the first question to be used as a rectangular area.

`1#include <cstdio>2#include <cstring>3#include <cmath>4#include <algorithm>5 using namespacestd;6 Const intN = 1e5 +Ten;7 structRec8 {9     intxa, ya, xb, YB;Ten }a[n]; One struct Line A { -     intx, ya, YB, num; -}b[n <<1]; the intHash[n <<1]; - intSum[n <<3], Flag[n <<3]; - intN; - Long LongAns =0; + BOOLCMP (ConstLine &aa,ConstLine &BB) - { +     returnAa.x <bb.x; A } at voidPushup (intXintTlintTR) - { -     if(Flag[x]) -SUM[X] = hash[tr +1] -HASH[TL]; -     Else if(TL! =TR) -SUM[X] = sum[x <<1] + sum[x <<1|1]; in     Else -SUM[X] =0; to     return; + } - voidUpdateintXintLintRintTlintTrintnum) the { *     if(L <= tl && R >=TR) \$     {Panax NotoginsengFLAG[X] + =num; - pushup (x, TL, TR); the         return; +     } A     intMid = (tl + TR) >>1; the     if(L <=mid) +Update (x <<1, L, R, TL, Mid, num); -     if(R >mid) \$Update (x <<1|1, L, R, Mid +1, TR, num); \$ pushup (x, TL, TR); - } - intMain () the { -scanf"%d", &n);Wuyi      for(inti =1; I <= N; ++i) the     { -scanf"%d%d%d%d", &a[i].xa, &a[i].ya, &AMP;A[I].XB, &a[i].yb); Wu         if(A[i].xa >A[I].XB) - swap (A[i].xa, A[I].XB); About         if(A[i].ya >A[i]. YB) \$ swap (A[i].ya, a[i].yb); -++A[I].XB; -++A[i].yb; -Hash[i *2-1] =A[i].ya; AHash[i *2] =A[i].yb; +B[i *2-1].x =A[i].xa; theB[i *2-1].num =1; -B[i *2].x =A[I].XB; \$B[i *2].num =-1; theB[i *2].ya = B[i *2-1].ya =A[i].ya; theB[i *2].YB = B[i *2-1].yb =A[i].yb; the     } theSort (hash +1, hash +1+ N *2); -Sort (b +1, B +1+ N *2, CMP); inb[0].x = b[1].x; the      for(inti =1; I <= N *2; ++i) the     { About         intL, R; theL = Lower_bound (hash +1, hash +1+ N *2, B[i].ya)-Hash; theR = Lower_bound (hash +1, hash +1+ N *2, B[I].YB)-Hash-1; theAns + = (Long Long) (B[i].x-b[i-1].x) * sum[1]; +Update1, L, R,1N2-1, b[i].num); -     } theprintf"%lld\n", ans);Bayi     return 0; the}`

Codeforces 610D Vika and Segments

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