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- #include <iostream>
- using namespace std;
- int szuflady[1000000];
- int n;
- int ilWsunietych=0;
- int main()
- {
- cin>>n;
- for(int i=0; i<n; i++){
- cin>>szuflady[i];
- }
- n--;
- while(n>0)
- {
- if(szuflady[n]<=szuflady[n-1]){
- szuflady[n-1]=szuflady[n]-1;
- ilWsunietych++;
- }
- n--;
- }
- if(szuflady[0]>0){
- cout<<ilWsunietych;
- }
- else
- {
- cout<<"-1";
- }
- return 0;
- }
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