#include <bits/stdc++.h> #define ll long long #define F first #define S second #define SI size() #define pb push_back using namespace std; const ll MAX=1000007; ll i,m,n,sum,a[MAX],ans; int main(){ cin>>n; for (i=0;i<n;i++){ ll x; scanf ("%I64d",&x); if (a[x]==0){ ans++; a[x-1]++; } if (a[x]==1){ a[x]--; a[x-1]--; } } cout<<ans; }

baloni.cpp: In function 'int main()':
baloni.cpp:14:26: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
         scanf ("%I64d",&x);
                          ^
baloni.cpp:14:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf ("%I64d",&x);
                           ^