Problem:
Score : 800 points

Problem Statement

There is a grid with R rows and C columns.
We call the cell in the r-th row and c-th column (r，c).

Mr. Takahashi wrote non-negative integers into N of the cells, that is, he wrote a non-negative integer a_i into (r_i，c_i) for each i (1≤i≤N).
After that he fell asleep.

Mr. Aoki found the grid and tries to surprise Mr. Takahashi by writing integers into all remaining cells.
The grid must meet the following conditions to really surprise Mr. Takahashi.

Condition 1: Each cell contains a non-negative integer.

Condition 2: For any 2×2 square formed by cells on the grid, the sum of the top left and bottom right integers must always equal to the sum of the top right and bottom left integers.

Determine whether it is possible to meet those conditions by properly writing integers into all remaining cells.

Constraints

2≤R，C≤10^5

1≤N≤10^5

1≤r_i≤R

1≤c_i≤C

(r_i，c_i) ≠ (r_j，c_j) (i≠j)

a_i is an integer.

0≤a_i≤10^9

Input

The input is given from Standard Input in the following format:

R C
N
r_1 c_1 a_1
r_2 c_2 a_2
:
r_N c_N a_N

Output

Print Yes if it is possible to meet the conditions by properly writing integers into all remaining cells.
Otherwise, print No.

Sample Input 1

2 2
3
1 1 0
1 2 10
2 1 20

Sample Output 1

Yes

You can write integers as follows.

Sample Input 2

2 3
5
1 1 0
1 2 10
1 3 20
2 1 30
2 3 40

Sample Output 2

No

There are two 2×2 squares on the grid, formed by the following cells:

Cells (1，1), (1，2), (2，1) and (2，2)

Cells (1，2), (1，3), (2，2) and (2，3)

You have to write 40 into the empty cell to meet the condition on the left square, but then it does not satisfy the condition on the right square.

Sample Input 3

2 2
3
1 1 20
1 2 10
2 1 0

Sample Output 3

No

You have to write -10 into the empty cell to meet condition 2, but then it does not satisfy condition 1.

Sample Input 4

3 3
4
1 1 0
1 3 10
3 1 10
3 3 20

Sample Output 4

Yes

You can write integers as follows.

Sample Input 5

2 2
4
1 1 0
1 2 10
2 1 30
2 2 20

Sample Output 5

No

All cells already contain a integer and condition 2 is not satisfied.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import static java.lang.Math.*;
import static java.util.Arrays.*;
 
import java.util.*;
import java.io.*;
import java.math.BigInteger;
 
import static java.math.BigInteger.*;
 
public class Main {
	
	
	void solve() {
		int R = sc.nextInt();
		int C = sc.nextInt();
		int N = sc.nextInt();
		int[] r = new int[N];
		int[] c = new int[N];
		int[] a = new int[N];
		for (int i = 0; i < N; i++) {
			r[i] = sc.nextInt();
			c[i] = sc.nextInt();
			a[i] = sc.nextInt();
		}
		
		int[][] x = new int[3][3];
		boolean ans = true;
		loop:
		for (int p = 0; p < N; p++) {
			for (int i = 0; i < 3; i++) for (int j = 0; j < 3; j++) x[i][j] = -1;
			x[1][1] = a[p];
			for (int i = 0; i < N; i++) if (i != p) {
				int s = r[i] < r[p] ? 0 : r[i] > r[p] ? 2 : 1;
				int t = c[i] < c[p] ? 0 : c[i] > c[p] ? 2 : 1;
				if (x[s][t] == -1 || x[s][t] == a[i]) {
					x[s][t] = a[i];
				} else {
					ans = false;
					break loop;
				}
			}
			if (!check(x[0][0], x[0][1], x[1][0], x[1][1])) { ans = false; break loop; }
			if (!check(x[0][1], x[0][2], x[1][1], x[1][2])) { ans = false; break loop; }
			if (!check(x[1][0], x[1][1], x[2][0], x[2][1])) { ans = false; break loop; }
			if (!check(x[1][1], x[1][2], x[2][1], x[2][2])) { ans = false; break loop; }
		}
		
		if (ans)
			out.println("Yes");
		else
			out.println("No");
	}
	
	boolean check(int a, int b, int c, int d) {
		int m = 0;
		if (a < 0) m++;
		if (b < 0) m++;
		if (c < 0) m++;
		if (d < 0) m++;
//		tr(a, b, c, d, m);
		if (m >= 2) return true;
		if (m == 0) {
			return a + d == b + c;
		}
		if (a == -1) { return b + c - d >= 0; }
		if (b == -1) { return a + d - c >= 0; }
		if (c == -1) { return a + d - b >= 0; }
		if (d == -1) { return b + c - a >= 0; }
		return false;
	}
	
	static void tr(Object... os) { System.err.println(deepToString(os)); }
	static void tr(int[][] as) { for (int[] a : as) tr(a); }
 
	void print(int[] a) {
		out.print(a[0]);
		for (int i = 1; i < a.length; i++) out.print(" " + a[i]);
		out.println();
	}
 
	public static void main(String[] args) throws Exception {
		new Main().run();
	}
 
	MyScanner sc = null;
	PrintWriter out = null;
	public void run() throws Exception {
		sc = new MyScanner(System.in);
		out = new PrintWriter(System.out);
		for (;sc.hasNext();) {
			solve();
			out.flush();
		}
		out.close();
	}
 
	class MyScanner {
		String line;
		BufferedReader reader;
		StringTokenizer tokenizer;
 
		public MyScanner(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream));
			tokenizer = null;
		}
		public void eat() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					line = reader.readLine();
					if (line == null) {
						tokenizer = null;
						return;
					}
					tokenizer = new StringTokenizer(line);
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
		}
		public String next() {
			eat();
			return tokenizer.nextToken();
		}
		public String nextLine() {
			try {
				return reader.readLine();
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
		public boolean hasNext() {
			eat();
			return (tokenizer != null && tokenizer.hasMoreElements());
		}
		public int nextInt() {
			return Integer.parseInt(next());
		}
		public long nextLong() {
			return Long.parseLong(next());
		}
		public double nextDouble() {
			return Double.parseDouble(next());
		}
		public int[] nextIntArray(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++) a[i] = nextInt();
			return a;
		}
	}
}