Spreadsheet Tracking UVa512

 code:

#include<stdio.h>
#include<string.h>
#define maxd 10000
//#define LOCAL

// A structure contains: command, point before and now,
//                       the number of changed lines, the c\r index.
struct Command
{
    char c[5];
    int r1, c1, r2, c2;
    int a, x[20];
}cmd[maxd];

int r, c, n;

//a fuction be used to change the query(previous) point to the present point.
//CMD: EX(only one)  DC\R IC\R(lots of lines)
int simulate(int &r0, int &c0)
{
    for( int i = 0; i < n; i++)
    {
        int nr(0), nc(0); //to count the change number.
        if( cmd[i].c[0] == 'E' ) 
        {
            if( cmd[i].r1 == r0 && cmd[i].c1 == c0 ){ r0 = cmd[i].r2; c0 = cmd[i].c2;}
            else if( cmd[i].r2 == r0 && cmd[i].c2 == c0 ){ r0 = cmd[i].r1; c0 = cmd[i].c1;}
        }
        //judge the Delete or Insert.
        else
        {
            if(cmd[i].c[0] == 'D')
            {
                for(int j = 0; j < cmd[i].a; j++)
                {
                    //DC
                    if( cmd[i].c[1] == 'C' )
                    {
                        if( cmd[i].x[j] == c0 ) return 0;
                        if( cmd[i].x[j] < c0  ) nc--;
                    }
                    //DR
                    else
                    {
                        if( cmd[i].x[j] == r0 ) return 0;
                        if( cmd[i].x[j] <  r0 ) nr--;
                    }
                }
            }
            //IC/IR
            else
            {
                for( int j = 0; j < cmd[i].a; j++)
                {
                    //IC
                    if( cmd[i].c[1] == 'C')
                    {
                        if ( cmd[i].x[j] <= c0 ) nc++;
                    }
                    //IR
                    else
                    {
                        if ( cmd[i].x[j] <= r0 ) nr++;
                    }
                }
            }
        }

    r0 += nr;
    c0 += nc;
    }
    return 1;
}


int main()
{
    #ifdef LOCAL
    freopen("data.in", "r", stdin);
    freopen("data.out", "w", stdout);
    #endif

    int r0, c0, q, kase = 0;
    while(scanf("%d%d%d", &r, &c, &n) == 3 && r)
    {
        //We need the  i to record the index.
        for(int i = 0; i < n; i++)
        {
            scanf("%s", cmd[i].c);
            //CMD: EX DC\R IC\R
            if(cmd[i].c[0] == 'E')
            {
                scanf("%d%d%d%d", &cmd[i].r1, &cmd[i].c1, &cmd[i].r2, &cmd[i].c2);
            }
            else
            {
                scanf("%d", &cmd[i].a);
                for(int j = 0; j < cmd[i].a; j++)
                {
                    scanf("%d", &cmd[i].x[j]);
                }
            }
        }
        if(kase > 0) printf("\n");
        printf("Spreadsheet #%d\n", ++kase);

        scanf("%d", &q);
        //the format
        while(q--)
        {
            scanf("%d%d", &r0, &c0);
            printf("Cell data in (%d,%d) ", r0, c0);
            if(!simulate(r0, c0)) printf("GONE\n");
            else printf("moved to (%d,%d)\n", r0, c0);
        }
    }
    return 0;
}

1. 特别要注意if的连用问题，比如在情况EX里面 如果连个都写的是If, 那么会有有趣的事情发生， 两个数字换过去，竟然又换回来了，真的是很神奇。解决的方案也比较简单使用else if即可。
2. < and <=的使用要注意，因为这里比较隐蔽，很容易出现WA，而不知道哪里错了，因此在每次做题目的时候出现问题，需要在所有的判断处检查一下
3. . and ,因为这两个字符在键盘上的位置离得比较近，有的时候容易手误打错了，可是编译器有的时候不一定会报错，它可能会认为是逗号运算符就放过去了。