#include <bits/stdc++.h> #include <ext/pb_ds/tree_policy.hpp> #include <ext/pb_ds/assoc_container.hpp> using namespace std; using namespace __gnu_pbds; #pragma GCC optimize("Ofast,unroll-loops,inline-functions,no-stack-protector,03") #pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native") #pragma clang loop vectorize(enable) #pragma clang loop interleave(enable) #define int long long #define sz(x) (int)x.size() #define F first #define S second #define pb push_back #define nl '\n' #define o_set tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); typedef pair<int, int> pii; void file( string s = "" ) { if( s.empty() ) return; freopen((s + ".in").c_str(), "r", stdin); freopen((s + ".out").c_str(), "w", stdout); } const int N = 2e5 + 2; const int N1 = 1e6 + 2; const int inf = 1e9; const int INF = 1e18; const int mod = 1e9 + 7; const double eps = 1e-9; int T = 1, n, q, x, y, a[N], cur, t[N]; void upd( int i, int add ) { for( ; i <= n; i += i & -i ) t[i] += add; } int get( int i ) { int res = 0; for( ; i > 0; i -= i & -i ) res += t[i]; return res; } void solve() { cin >>n >>q >>x >>y; for( int i = 0; i <= n; ++i ) { cin >>a[i]; if( i > 0 ) cur += (a[i - 1] < a[i] ? -x : y) * abs(a[i] - a[i - 1]); } while( q-- ) { int l, r, add; cin >>l >>r >>add; cur -= (a[l - 1] + get(l - 1) < a[l] + get(l) ? -x : y) * abs(a[l] + get(l) - a[l - 1] - get(l - 1)); if( r < n ) cur -= (a[r] + get(r) < a[r + 1] + get(r + 1) ? -x : y) * abs(a[r + 1] + get(r + 1) - a[r] - get(r)); upd(l, add); upd(r + 1, -add); cur += (a[l - 1] + get(l - 1) < a[l] + get(l) ? -x : y) * abs(a[l] + get(l) - a[l - 1] - get(l - 1)); if( r < n ) cur += (a[r] + get(r) < a[r + 1] + get(r + 1) ? -x : y) * abs(a[r + 1] + get(r + 1) - a[r] - get(r)); cout <<cur <<nl; } } signed main() { file(""); ios_base::sync_with_stdio(false); cin.tie(nullptr); // cin >>T; while( T-- ) solve(); }

foehn_phenomena.cpp: In function 'void file(std::string)':
foehn_phenomena.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:28:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~