//Write a program that, given a sequence of lines with words, tells which is the first line that has the words in increasing (lexicographic) order.
//input: sequence of lines with words. Each line begins with a number n followed by n words of only lowercase letters
//output: index of the first line with the words in not necessary strictly increasing order. If there is no such line, tell so.
#include <iostream>
using namespace std;

int main () {
    //number of words in each sequence
    int n;
    
    //search order
    bool increase = false;
    bool increase1 = true;
    while (not increase and cin >> n) {
        //window of two elements
        string word2;
        cin >> word2;
        string word1 = word2;
        //search two element not increase order
        int i = 0;
        while (i < n and not increase1) {
            if (word2 > word1) increase1 = false;
            cout << word1 << ' ' << word2 << endl;
            word1 = word2;
            cin >> word2;
            ++i;
        }
    } if (not increase1) cout << "The frist line in increasing order is " << n << '.' << endl;
    else cout << "There is no line in increasing order." << endl;
}
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C++ Online Compiler

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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
}