【HDOJ】1892 See you~

wa了十次，原来变量名写错。二维树状数组。
 1 #include <cstdio>
 2 #include <cstring>
 3 
 4 #define MAXN 1002
 5 
 6 int nums[MAXN][MAXN];
 7 
 8 void swap(int *x, int *y) {
 9     int tmp;
10     tmp = *x;
11     *x = *y;
12     *y = tmp;
13 }
14 
15 int lowbit(int i) {
16     return i & (-i);
17 }
18 
19 void add(int x, int y, int v) {
20     for (int i=x; i<MAXN; i+=lowbit(i))
21         for (int j=y; j<MAXN; j+=lowbit(j))
22             nums[i][j] += v;
23 }
24 
25 void build() {
26     int i, j;
27     memset(nums, 0, sizeof(nums));
28     for (i=1; i<MAXN; ++i)
29         for (j=1; j<MAXN; ++j)
30             add(i, j, 1);
31 }
32 
33 int query(int x, int y) {
34     int val = 0;
35     for (int i=x; i>0; i-=lowbit(i))
36         for (int j=y; j>0; j-=lowbit(j))
37             val += nums[i][j];
38     return val;
39 }
40 
41 int main() {
42     int t, n;
43     int x1, y1, x2, y2, v, tmp;
44     int in;
45     char cmd[3];
46 
47     scanf("%d", &t);
48     for (in=1; in<=t; ++in) {
49         build();
50         scanf("%d", &n);
51         printf("Case %d:
", in);
52         while (n--) {
53             scanf("%s", cmd);
54             if (cmd[0] == 'S') {
55                 scanf("%d %d %d %d", &x1, &y1, &x2, &y2);
56                 ++x1; ++y1; ++x2; ++y2;
57                 if (x1 > x2)
58                     swap(&x1, &x2);
59                 if (y1 > y2)
60                     swap(&y1, &y2);
61                 v = query(x2,y2) - query(x1-1,y2) - query(x2,y1-1) + query(x1-1,y1-1);
62                 printf("%d
", v);
63             } else if (cmd[0] == 'M') {
64                 scanf("%d %d %d %d %d", &x1,&y1,&x2,&y2,&v);
65                 ++x1; ++y1; ++x2; ++y2;
66                 tmp = query(x1-1,y1-1) - query(x1-1,y1) - query(x1,y1-1) + query(x1,y1);
67                 if (v > tmp)
68                     v = tmp;
69                 add(x1, y1, -v);
70                 add(x2, y2, v);
71             } else if (cmd[0] == 'A') {
72                 scanf("%d %d %d", &x1, &y1, &v);
73                 ++x1; ++y1;
74                 add(x1, y1, v);
75             } else if (cmd[0] == 'D') {
76                 scanf("%d %d %d", &x1, &y1, &v);
77                 ++x1; ++y1;
78                 tmp = query(x1-1,y1-1) - query(x1-1,y1) - query(x1,y1-1) + query(x1,y1);
79                 if (v > tmp)
80                     v = tmp;
81                 add(x1, y1, -v);
82             }
83         }
84     }
85 
86     return 0;
87 }