#include <iostream>
#include <cstring>
using namespace std;
//c:Mảng chi phí
//x:Mảng cấu hình thứ tự đi các thành phố
int n,c[102][102], x[101],d=0;
//Mảng visisted đánh dấu các thành phố đã đi qua
int visited[101];
int cost= 0,res= 1e6+7,cmin= 1e6+7;
void nhap() {
    for(int i =1 ; i<=n ; i++)
        for(int j =1 ; j<=n ; j++) {
            cin>>c[i][j];
            if(c[i][j] != 0) cmin= min(cmin,c[i][j]);
        }
    memset(visited,0,sizeof(visited));
}
void Try(int i) {
    for(int j = 1; j<=n ; j++) {
        if(visited[j] ==0) {
            visited[j] =1;
            x[i] =j;
            d+= c[x[i-1]][x[i]];
            if(i==n) {
                //Cập nhật kết quả
                res= min(res,d+c[x[n]][x[1]]);
            } else
            //Đánh giá cận
                if(d+(n-i+1) * cmin < res)
                    Try(i+1);
            //Backtrack
            visited[j] =0;
            d-= c[x[i-1]][x[i]];
        }
    }
}
int main() {
    cin>>n;
    nhap();
    x[1]=1;
    visited[1]=1;
    Try(2);
    if(n == 1) res = 0;
    cout<<res;
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

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
}