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- #include <iostream>
- using namespace std;
- int main(){
- int n;
- cin>>n;
- int array[n+1];
- array[n]=0;
- for(int i=0;i<n;i++){
- cin>>array[i];
- }
- int cont=0;
- int finale=1;
- int o=0;
- int s;
- while(finale==1){
- s=o+1;
- while(array[s]>0||array[o]>0){
- array[s]--;
- s++;
- }
- if(array[o]>0)
- cont++;
- array[o]--;
- if(array[o]<1)
- o++;
- if(o==n-1&&array[o]==0)
- finale=0;
- }
- cout<<cont;
- return 0;
- }
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