#include <bits/stdc++.h> using namespace std; #define int long long #define FOR(I, L, R) for(int I(L) ; I <= (int)R ; ++I) #define FOD(I, R, L) for(int I(R) ; I >= (int)L ; --I) #define FOA(I, A) for(auto &I : A) #define print(A,L,R) FOR(OK, L, R){if(A[OK]<=-oo / 10||A[OK]>=oo)cout<<"- ";else cout<<A[OK]<<' ';}cout<<'\n'; #define prints(A) FOA(OK, A){cout<<OK<<' ';}cout << '\n'; #define printz(A,L,R) FOR(OK, 1, L){FOR(KO, 0, R){if(A[OK][KO]>-oo&&A[OK][KO]<oo)cout<<A[OK][KO]<<' ';else cout << "- ";} cout << '\n';}cout << '\n'; #define fs first #define sd second #define ii pair<int,int> #define iii pair<int, ii> #define all(A) A.begin(), A.end() #define quickly ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); #define FILE "FILE" const int N = 3e5 + 5; const int mod = 1e9 + 9999; const int oo = 1e18; struct Modint{ int x; Modint(){x = 0;} Modint(int _x){x = (_x + mod) % mod;} Modint operator + (const Modint &other) const{ return Modint((x + other.x) % mod); } Modint operator - (const Modint &other) const{ return Modint((x - other.x + mod) % mod); } Modint operator * (const Modint &other) const{ return Modint((1LL * x * other.x) % mod); } void operator += (const Modint &other) { *this = *this + other; } void operator -= (const Modint &other) { *this = *this - other; } void operator *= (const Modint &other) { *this = *this * other; } friend ostream& operator << (ostream& os, const Modint &other){ return os << other.x; } }; int n; int a[N]; int pre[N], suf[N]; signed main(){ quickly if(fopen(FILE".in", "r")){ freopen(FILE".in", "r", stdin); freopen(FILE".out", "w", stdout); } cin >> n; FOR(i, 1, n){ cin >> a[i]; } FOR(i, 2, n){ pre[i] = pre[i - 1] + max(0LL, a[i - 1] - a[i]); } FOD(i, n - 1, 1){ suf[i] = suf[i + 1] + max(0LL, a[i + 1] - a[i]); } int ans = oo; FOR(i, 1, n){ ans = min(ans, max(pre[i], suf[i])); } cout << ans; }

Main.cpp: In function 'int main()':
Main.cpp:52:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |                 freopen(FILE".in", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:53:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |                 freopen(FILE".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~