hdu4941 Magical Forest

Posted 2020-09-17 claireyuancy

Problem Description

There is a forest can be seen as N * M grid. In this forest, there is some magical fruits, These fruits can provide a lot of energy, Each fruit has its location(Xi, Yi) and the energy can be provided Ci. 

However, the forest will make the following change sometimes: 
1. Two rows of forest exchange. 
2. Two columns of forest exchange. 
Fortunately, two rows(columns) can exchange only if both of them contain fruits or none of them contain fruits. 

Your superior attach importance to these magical fruit, he needs to know this forest information at any time, and you as his best programmer, you need to write a program in order to ask his answers quick every time.

Input

The input consists of multiple test cases. 

The first line has one integer W. Indicates the case number.(1<=W<=5)

For each case, the first line has three integers N, M, K. Indicates that the forest can be seen as maps N rows, M columns, there are K fruits on the map.(1<=N, M<=2*10^9, 0<=K<=10^5)

The next K lines, each line has three integers X, Y, C, indicates that there is a fruit with C energy in X row, Y column. (0<=X<=N-1, 0<=Y<=M-1, 1<=C<=1000)

The next line has one integer T. (0<=T<=10^5)
The next T lines, each line has three integers Q, A, B. 
If Q = 1 indicates that this is a map of the row switching operation, the A row and B row exchange. 
If Q = 2 indicates that this is a map of the column switching operation, the A column and B column exchange. 
If Q = 3 means that it is time to ask your boss for the map, asked about the situation in (A, B). 
(Ensure that all given A, B are legal. )

 

Output

For each case, you should output "Case #C:" first, where C indicates the case number and counts from 1.

In each case, for every time the boss asked, output an integer X, if asked point have fruit, then the output is the energy of the fruit, otherwise the output is 0.

 

Sample Input

1
3 3 2
1 1 1
2 2 2
5
3 1 1
1 1 2
2 1 2
3 1 1
3 2 2

 

Sample Output

Case #1:
1
2
1

Hint
No two fruits at the same location.
 

 

题目中的N, M 太大   所以不能直接记录

用两个map表示，row[i] = j 表示 i行换到了j行，反之同理  col表示列 

另外一个map   maze记录<i, j>这个位置的值

每次查询前先将正确的行列在row,col中映射。输出答案就可以

#include <cstdio>
#include <ctime>
#include <cstdlib>
#include <cstring>
#include <queue>
#include <string>
#include <set>
#include <stack>
#include <map>
#include <cmath>
#include <vector>
#include <iostream>
#include <algorithm>
#include <bitset>
#include <fstream>
using namespace std;
//LOOP
#define FF(i, a, b) for(int i = (a); i < (b); ++i)
#define FE(i, a, b) for(int i = (a); i <= (b); ++i)
#define FED(i, b, a) for(int i = (b); i>= (a); --i)
#define REP(i, N) for(int i = 0; i < (N); ++i)
#define CLR(A,value) memset(A,value,sizeof(A))
//OTHER
#define PB push_back
//INPUT
#define RI(n) scanf("%d", &n)
#define RII(n, m) scanf("%d%d", &n, &m)
#define RIII(n, m, k) scanf("%d%d%d", &n, &m, &k)
#define RIV(n, m, k, p) scanf("%d%d%d%d", &n, &m, &k, &p)
#define RV(n, m, k, p, q) scanf("%d%d%d%d%d", &n, &m, &k, &p, &q)
#define RS(s) scanf("%s", s)
//OUTPUT

#define sqr(x) (x) * (x)
typedef long long LL;
typedef unsigned long long ULL;
typedef vector <int> VI;
const double eps = 1e-9;
const int MOD = 1000000007;
const double PI = acos(-1.0);
const int INF = 0x3f3f3f3f;
const int maxn = 100010;

map<int, int>col, row;
map<pair<int, int>, int>maze;
int main()
{
    //freopen("0.txt", "r", stdin);
    int T, n, m, k, a, t;
    RI(T);
    FE(kase, 1, T)
    {
        row.clear(), col.clear(), maze.clear();
        printf("Case #%d:\n", kase);
        RIII(n, m, k);
        int x, y, c, Q;
        REP(i, k)
        {
            RIII(x, y, c);
            maze[make_pair(x, y)] = c;
        }
        int tx, ty;
        RI(Q);
        while (Q--)
        {
            RIII(c, x, y);
            tx = x, ty = y;
            if (c == 2)
            {
                if (col.count(x))   tx = col[x];
                if (col.count(y))   ty = col[y];
                col[x] = ty;
                col[y] = tx;
            }
            else if (c == 1)
            {
                if (row.count(x))   tx = row[x];
                if (row.count(y))   ty = row[y];
                row[x] = ty;
                row[y] = tx;
            }
            else
            {
                if (row.count(x))
                    x = row[x];
                if (col.count(y))
                    y = col[y];
                a = 0;
                if (maze.count(make_pair(x, y)))
                    a = maze[make_pair(x, y)];
                printf("%d\n", a);
            }
        }
    }
    return 0;
}