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


void calc_primes(int N)  //seive of eratosthenese
{
    v.resize(N+1,0);
    v[1]=0;
    if(N==1) return;
    for(int i=2;i<=N;i++)
    {
        int t=i;
        int c=2;
        while(t<=N)
        {
            t=i*c;
            c++;
            v[t]=1;
        }
    }
    v[2]=1;
    for(int i=3;i<=N;i++) 
    {
        if(v[i]==0) v[i]=v[i-1]+1;
        else v[i]=v[i-1];
    }
}

int jump(int i, string &s, int r1,int r2, int N, vector<int> &M)
{
    if(s[i]=='*') return INT_MAX;
    if(i==N-1) return 1;
    if(i>N-1) return INT_MAX;
    if(M[i]!=-1) return M[i];

    int A=v[i+1];
    int a = jump(i+1,s,r1,r2,N,M);
    int b = jump(i+2,s,r1,r2,N,M);
    int c=INT_MAX;
    if(v[i+1]/i >= r1/r2)
    {
        c = jump(i+A,s,r1,r2,N,M);
    }
    int res=INT_MAX;
    if(a!=INT_MAX)  res=min(res,a);
    if(b!=INT_MAX) res=min(res,b);
    if(c!=INT_MAX) res=min(res,c);

    if(res==INT_MAX) return M[i]=res;
    return M[i]=1+res;

}






string trap_sol (int r1, int r2, int N, string s) {
  // Write your code here
    vector<int> M(N+1,-1);
    calc_primes(N);

    int ans = jump(0,s,r1,r2,N,M);
    if(ans==INT_MAX) return "No way!";
    return to_string(ans);

}

int main() {
  int r1,r2,N;
  string s;
  cin>>r1>>r2>>N;
  cin>>s;
  cout<<"yes\n";
  cout<<trap_sol(r1,r2,N,s);
  

}
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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
}