This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
using vi = vector<int>;
using vb = vector<bool>;
using pi = pair<int, int>;
#define pb push_back
#define all(x) x.begin(), x.end()
#define FOR(i, a, b) for (int i = (int) a; i < (int) b; i++)
#define rep(i, n) for (int i = 0; i < (int) n; i++)
#define rep1(i, n) for (int i = 1; i <= (int) n; i++)
#define sz(x) (int) x.size()
#define fi first
#define se second
#define rd(a, sz) rep(i, n) cin >> a[i];
#define rd1(a, sz) rep1(i, n) cin >> a[i];
void __print(int x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ", "; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? ", " : ""), __print(i); cerr << '}';}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(...) cerr << "[" << #__VA_ARGS__ << "] = ["; _print(__VA_ARGS__)
#else
#define debug(...)
#endif
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
const int MOD = 1e9 + 7;
const int inf = 1e18;
void solve(int tc) {
int n, idx = -1, inc = 0; cin >> n;
vector<int> a(n);
rd(a, n);
for (int i = n - 2; i >= 0; i--) {
if (a[i] <= a[i + 1]) idx = i + 1;
}
if (idx == -1) {
cout << "0\n";
return;
}
// cout << idx << "\n";
for (int i = 0; i < idx; i++) {
// cout << a[i] << " " << inc << " " << a[i + 1] << "\n";
if (a[i] >= a[i + 1]) {
inc += abs(a[i + 1] - a[i]) + 1;
}
}
cout << inc << "\n";
}
signed main() {
ios::sync_with_stdio(0); cin.tie(0);
int tt = 1;
// cin >> tt;
rep1(i, tt) solve(i);
return 0;
}
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