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;
typedef long long ll;
const int maxn = 2e5 + 5;
int n;
int A[maxn];
int B[maxn];
int C[maxn];
int M1[maxn], M2[maxn];
ll pref[maxn];
ll suff[maxn];
int main() {
scanf("%d", &n);
for(int i = 0;i < n;i++)
scanf("%d", A + i);
B[0] = 0;
int maxi = A[0] + 1;
for(int i = 1;i < n;i++)
B[i] = max(maxi - A[i], 0), maxi = max(maxi, A[i]) + 1, M1[i] = maxi;
for(int i = 1;i < n;i++)
pref[i] = pref[i - 1] + (ll)max(B[i] - B[i - 1], 0);
C[n - 1] = 0;
maxi = A[n - 1] + 1;
for(int i = n - 2;i >= 0;i--)
C[i] = max(maxi - A[i], 0), maxi = max(maxi, A[i]) + 1, M2[i] = maxi;
for(int i = n - 2;i >= 0;i--)
suff[i] = suff[i + 1] + (ll)max(C[i] - C[i + 1], 0);
ll ans = min(pref[n - 1], suff[0]);
for(int i = 0;i < n - 1;i++)
ans = min(ans, max(pref[i], suff[i + 1]) + (M1[i] == M2[i + 1]));
printf("%lld\n", ans);
return 0;
}
Compilation message (stderr)
Main.cpp: In function 'int main()':
Main.cpp:18:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
18 | scanf("%d", &n);
| ~~~~~^~~~~~~~~~
Main.cpp:20:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
20 | scanf("%d", A + i);
| ~~~~~^~~~~~~~~~~~~
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