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

typedef long long int ll;
const char nl = '\n';

int main() {
  vector<ll> req = {1, 1, 1};
  int m = req.size();

  vector<vector<ll>> blocks = {{0, 1, 0}, {1, 0, 0}, {1, 1, 0}, {0, 1, 0}, {0, 1, 1}};
  int n = blocks.size();
  
  vector<vector<ll>> dist(n, vector<ll>(m));
  
  for (ll i = 0; i < m; i += 1) {
    if (blocks[0][i] == 0) dist[0][i] = INT32_MAX;
    else dist[0][i] = 0;
  }
  
  for (ll i = 1; i < n; i += 1) {
    for (ll j = 0; j < m; j += 1) {
      if (blocks[i][j] == 1) dist[i][j] = 0;
      else dist[i][j] = dist[i - 1][j] + 1;
    }
  }
  
  for (ll i = n - 2; i >= 0; i -= 1) {
    for (ll j = 0; j < m; j += 1) {
      if (blocks[i][j] != 1) dist[i][j] = min(dist[i][j], dist[i + 1][j] + 1);
    }
  }
  
  // for (ll i = 0; i < n; i += 1) {
  //   for (ll j = 0; j < m; j += 1) {
  //     cout << dist[i][j] << ' ';
  //   }
  //   cout << nl;
  // }
  
  ll mnWalk = INT32_MAX;
  ll minIdx;
  
  for (ll i = 0; i < n; i += 1) {
    ll walkD = *max_element(dist[i].begin(), dist[i].end());
    if (walkD < mnWalk) {
      mnWalk = walkD;
      minIdx = i;
    }
  }
  
  cout << minIdx << nl;
  
  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
}