HDU5618 Jam's problem again

CDQ分治模板题

#include<cstdio>
#include<cctype>
#include<algorithm>
#include<cstring>
using namespace std;
inline int read()
{
    int x = 0, flag = 1;
    char c;
    while(! isgraph(c = getchar()))
        if(c == '-')
            flag *= - 1;
    while(isgraph(c))
        x = x * 10 + c - '0', c = getchar();
    return x * flag;
}
void println(int x)
{
    if(x < 0)
        putchar('-');
    if(x == 0)
        putchar('0');
    int ans[10 + (1 << 4)], top = 0;
    while(x)
        ans[top ++] = x % 10, x /= 10;
    for(; top; top --)
        putchar(ans[top - 1] + '0');
    putchar('\n');
}
const int MAXN = (int)1e5 + (1 << 5);
struct node
{
    int x, y, z, ID;
    node(int x = 0, int y = 0, int z = 0, int ID = 0): x(x), y(y), z(z), ID(ID){}
}a[MAXN], b[MAXN];
int operator <(node x, node y)
{
    if(x.x != y.x)
        return x.x < y.x;
    if(x.y != y.y)
        return x.y < y.y;
    return x.z <= y.z;
}
int ans[MAXN];
int cmp(node x, node y)
{
    if(x.y != y.y)
        return x.y < y.y;
    return x.ID < y.ID;
}
int tree[MAXN];
int MAXZ;
void modify(int u, int delta)
{
    while(u <= MAXZ)
        tree[u] += delta, u += (u & (-u));
}
int query(int u)
{
    int ret = 0;
    while(u)
        ret += tree[u], u -= (u & (- u));
    return ret;
}
void CDQ(int L, int R)
{
    if(L == R)
        return;
    int mid = (L + R) >> 1;
    int top = 0;
    for(int i = L; i <= mid; i ++)
        b[top ++] = node(0, a[i].y, a[i].z, 0);
    for(int i = mid + 1; i <= R; i ++)
        b[top ++] = node(0, a[i].y, a[i].z, a[i].ID);
    sort(b, b + top, cmp);
    for(int i = 0; i < top; i ++)
    {
        if(b[i].ID == 0)
            modify(b[i].z, 1);
        else
            ans[b[i].ID] += query(b[i].z);
    }
    for(int i = 0; i < top; i ++)
        if(b[i].ID == 0)
            modify(b[i].z, - 1);
    CDQ(L, mid);
    CDQ(mid + 1, R);
}
int main()
{
    #ifndef ONLINE_JUDGE
    freopen("HDU5618.in", "r", stdin);
    freopen("HDU5618.out", "w", stdout);
    #endif
    int T = read();
    while(T --)
    {
        int n = read();
        for(int i = 1; i <= n; i ++)
        {
            int x = read(), y = read(), z = read();
            a[i] = node(x, y, z, i);
            MAXZ = max(MAXZ, a[i].z);
        }
        sort(a + 1, a + n + 1);
        memset(ans, 0, sizeof(ans));
        memset(tree, 0, sizeof(tree));
        int cnt = 0;
        for(int i = n; i; i --)
        {
            if((a[i].x == a[i + 1].x)
                && (a[i].y == a[i + 1].y)
                && (a[i].z == a[i + 1].z))
                cnt ++;
            else
                cnt = 0;
            ans[a[i].ID] += cnt;
        }
        CDQ(1, n);
        for(int i = 1; i <= n; i ++)
            println(ans[i]);
    }
}