cf 11a Increasing Sequence

#include <iostream>
#include <cstdio>
using namespace std;
#define LL long long
#define ULL unsigned long long
int main()
{
    int n,d;
    ULL ans=0;
    LL b[2005];
    scanf("%d%d",&n,&d);
    for(int i=0;i<n;i++)
        scanf("%I64d",&b[i]);
    for(int i=1;i<n;i++)
        if(b[i]<=b[i-1])
        {
            if(b[i]==b[i-1])
            {
                ans+=1;
                b[i]+=d;
            }
            else
            {
                int tmp=(b[i-1]-b[i])/d+1;
                ans+=tmp;
                b[i]+=tmp*d;
            }
        }
    printf("%I64d\n",ans);
    return 0;
}

### Increment Decrement Sequence Implementation In programming, an increment-decrement sequence typically refers to operations that involve increasing or decreasing values by a fixed amount iteratively. This concept can be implemented using loops and arithmetic operators. A common way to implement such sequences involves initializing variables with start values and then applying increments or decrements within loop structures: ```cpp // C++ example demonstrating inc/dec sequence #include <iostream> int main() { int value = 0; // Initial value while (value < 5) { // Loop condition std::cout << "Incrementing: " << ++value << '\n'; // Pre-increment operation } while (value > 0) { std::cout << "Decrementing: " << --value << '\n'; // Pre-decrement operation } return 0; } ``` For more complex scenarios involving collections like arrays or vectors, iterator-based approaches provide flexibility when traversing elements forward or backward[^2]: ```cpp std::vector<int> numbers{1, 2, 3, 4}; for(auto it = numbers.begin(); it != numbers.end(); ++it){ *it += 1; // Increment each element via dereferenced iterator } for(auto rit = numbers.rbegin(); rit != numbers.rend(); ++rit){ *rit -= 1; // Decrement from reverse direction similarly } ``` Iterators allow for efficient traversal over container types without exposing underlying data structure details. When working with standard template library containers, iterators offer powerful ways to manipulate sequences through generic algorithms provided by the C++ Standard Library. Regarding specific implementations of `incdec` as mentioned in some contexts, these might refer to specialized functions designed around particular requirements not covered here directly but following similar principles outlined above.
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