 #include <bits/stdc++.h>
using namespace std;

int main() {
  srand(2);
  int a[201][201];
  
  for(int i = 1; i <= 200; i++) for(int j = 1; j <= 200; j++) a[i][j] = 0;
  
  vector<pair<int, int> > v;
  
  //---------------- SET UP ADJACENCY MATRIX ----------------
  
  for(int i = 1; i <= 200; i++){
    string s, temp = "";
    getline(cin, s);
    
    for(int j = 0; j < s.length(); j++){
      if (s[j] != 9){
        temp += s[j];
      } else {
        stringstream container(temp); int k; container >> k; temp = "";
        if(i > k && k != 0) {
          a[i][k] = 1;
          v.push_back(make_pair(i, k));
        }
      }
    }
  }
  //---------------- PROCESS PAIRS WHEN > 1 PAIR REMAINING ----------------

  while(v.size() != 1){
    int r = rand() % v.size();
    int f = v[r].first, s = v[r].second;

    v[r] = v[v.size()-1]; v.pop_back();
    
    //---------------- PROCESS VERTICES LARGER THAN THE ONE TO BE DELETED ----------------
    
    for(int i = f+1; i <= 200; i++) {
      
      if(a[i][f] != 0 && a[i][f] != -1) {
        a[i][s] += a[i][f];
        
        for(int j = 0; j < v.size(); j++) {
          if (v[j].first == i && v[j].second == f ) {
            if(find(v.begin(), v.end(), make_pair(i, s) ) == v.end() ){
              v[j] = make_pair(i, s); 
            } else {
              v[j] = v[v.size()-1]; v.pop_back();
            }
            break;
          }
        }
      }
      a[i][f] = -1;
    }
    
    //---------------- PROCESS VERTICES SMALLER THAN THE ONE TO BE DELETED ----------------

    for(int i = 1; i < f; i++){
      if (a[f][i] != 0 && a[f][i] != -1 && i != s){
        if(i > s){
          a[i][s] += a[f][i];
        } else if ( i < s){
          a[s][i] += a[f][i];
        }
        
        for(int j = 0; j < v.size(); j++){
          if (v[j].first == f && v[j].second == i) {
            if(i > s && find(v.begin(), v.end(), make_pair(i, s)) == v.end() ){
              v[j] = make_pair(i, s);
            } else if (i < s && find(v.begin(), v.end(), make_pair(s, i)) == v.end() ){
              v[j] = make_pair(s, i);
            }
          }
        }
      }
      if(i != s ) a[f][i] = -1;
    }
    a[f][s] = -1;
  }
  
  for(int i = 1; i <= 200; i++) { 
    for(int j = 1; j <= 200; j++) {
      if(a[i][j] !=0 && a[i][j] != -1) cout << a[i][j];
    }
    cout << "\n";
  }
  
  cout << v[0].first << " " << v[0].second << "\n";
  cout << a[v[0].first][v[0].second];
}





/*
        if(a[1][1]> 0){
          cout << "a[1][1]: " << to_string(a[1][1]) << " i: " << to_string(i) << " f: " << to_string(f) << " s: " << to_string(s) << "\n"; 
        }
        */
         //cout << to_string(f) << " " << to_string(s) << "\n";
           //cout << "\n\n" << v[0].first << " " << v[0].second;
           
    /*
  for(int i = 1; i <= 200; i++) { 
    for(int j = 1; j <= 200; j++) {
      cout << a[i][j];
    }
    cout << "\n";
  }
  */
  //for(int i = 0; i < v.size(); i++) cout << v[i].first << " " << v[i].second << "\n";
  
      //cout << f << " " << s << "\n";

created 2 years ago

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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
}