hdu 1556 Color the ball (技巧 || 线段树)

Color the ball
Time Limit: 9000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 28415    Accepted Submission(s): 13851

Problem Description
N个气球排成一排，从左到右依次编号为1,2,3....N.每次给定2个整数a b(a <= b),lele便为骑上他的“小飞鸽"牌电动车从气球a开始到气球b依次给每个气球涂一次颜色。但是N次以后lele已经忘记了第I个气球已经涂过几次颜色了，你能帮他算出每个气球被涂过几次颜色吗？
 

Input
每个测试实例第一行为一个整数N,(N <= 100000).接下来的N行，每行包括2个整数a b(1 <= a <= b <= N)。
当N = 0，输入结束。
 

Output
每个测试实例输出一行，包括N个整数，第I个数代表第I个气球总共被涂色的次数。
 

Sample Input
3
1 1
2 2
3 3
3
1 1
1 2
1 3
0
 

Sample Output
1 1 1
3 2 1

C/C++（线段树）：

#include <map>
#include <queue>
#include <cmath>
#include <vector>
#include <string>
#include <cstdio>
#include <cstring>
#include <climits>
#include <iostream>
#include <algorithm>
#define INF 0x3f3f3f3f
using namespace std;
const int MAX = 5e5 + 10;

int n, a, b;

struct nod
{
    int L, R, val;
}node[MAX];

void build(int d, int l, int r)
{
    node[d].L = l, node[d].R = r, node[d].val = 0;
    if (l == r) return;
    int mid = (l + r) >> 1;
    build(d << 1, l, mid);
    build((d << 1) + 1, mid + 1, r);
}

void update(int d, int l, int r)
{
    if (node[d].L == l && node[d].R == r)
    {
        node[d].val ++;
        return;
    }
    if (node[d].L == node[d].R) return;
    int mid = (node[d].L + node[d].R) >> 1;
    if (r <= mid)
        update(d << 1, l, r);
    else if (mid < l)
        update((d << 1) + 1, l, r);
    else
    {
        update(d << 1, l, mid);
        update((d << 1) + 1, mid + 1, r);
    }
}

int query(int d, int l, int r)
{
    if (node[d].L == l && node[d].R == r) return node[d].val;
    if (node[d].L == node[d].R) return 0;
    int mid = (node[d].L + node[d].R) >> 1;
    if (r <= mid)
        return node[d].val + query(d << 1, l, r);
    else if (mid < l)
        return node[d].val + query((d << 1) + 1, l, r);
    else
        return node[d].val + query(d << 1, l, mid) + query((d << 1) + 1, mid + 1, r);
}

int main()
{
    while (scanf("%d", &n), n)
    {
        build(1, 1, n);
        for (int i = 0; i < n; ++ i)
        {
            scanf("%d%d", &a, &b);
            update(1, a, b);
        }
        for (int i = 1; i < n; ++ i)
            printf("%d ", query(1, i, i));
        printf("%d
", query(1, n, n));
    }
    return 0;
}

C/C++（技巧）：

#include <map>
#include <queue>
#include <cmath>
#include <vector>
#include <string>
#include <cstdio>
#include <cstring>
#include <climits>
#include <iostream>
#include <algorithm>
#define INF 0x3f3f3f3f
using namespace std;
const int MAX = 1e5 + 10;

int n, a, b;

int main()
{
    while (scanf("%d", &n), n)
    {
        int num[MAX] = {0}, m = 0;
        for (int i = 1; i <= n; ++ i)
        {
            scanf("%d%d", &a, &b);
            num[a] ++, num[b + 1] --;
        }
        for (int i = 1; i < n; ++ i)
        {
            m += num[i];
            printf("%d ", m);
        }
        printf("%d
", m + num[n]);
    }
    return 0;
}