T2

跟这次3级的糖果那题差不多(个人感觉)

#include<bits/stdc++.h>
using namespace std;
int main(){
    long long n,a[110000];
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }long long sum=0;
    for(int i=1;i<=n;i++){
        if(!(a[i-1]<=a[i])){
            while(!(a[i-1]<=a[i])){
                a[i]++,sum++;
            }
        }
    }cout<<sum;
    return 0;
}