#include <iostream>
using namespace std;

int main(){
    int n, m, i, j, k, a[100][100];
    cin >> n >> m;
    for(i = 0; i < n; i++){
        for(j = 0; j < m; j++)
            cin >> a[i][j];
    }
    int top = 0, bottom = n - 1, left = 0, right = m - 1;
    int dir = 1;
    bool isConsecutive = true;
    int currentNumber = 0;
    while (top <= bottom && left <= right && isConsecutive) {
        if (dir == 1) { 
            for (int i = left; i <= right; ++i) {
                if (a[top][i] > currentNumber) {
                  currentNumber = a[top][i];  
                } else {
                  isConsecutive = false;
                  break;
                }
                
            }
            ++top;
            dir = 2;
        } else if (dir == 2) {    
            for (int i = top; i <= bottom; ++i) {
                if (a[i][right] > currentNumber) {
                  currentNumber = a[i][right];  
                } else {
                  isConsecutive = false;
                  break;
                }
            }
            --right;
            dir = 3;
        } else if (dir == 3) { 
            for (int i = right; i >= left; --i) {
                if (a[bottom][i] > currentNumber) {
                  currentNumber = a[bottom][i];  
                } else {
                  isConsecutive = false;
                  break;
                }
            }
            --bottom;
            dir = 4;
        } else if (dir == 4) { 
            for (int i = bottom; i >= top; --i) {
                if (a[i][left] > currentNumber) {
                  currentNumber = a[i][left];  
                } else {
                  isConsecutive = false;
                  break;
                }
            }
            ++left;
            dir = 1;
        }
    }
    if (isConsecutive) {
      cout << "DA";
    } else {
      cout << "NU";
    }
    return 0;
}
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Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}