// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;
template<class T>
bool minimize(T &a, const T &b) {
if (a > b) return a = b, true;
return false;
}
template<class T>
bool maximize(T &a, const T &b) {
if (a < b) return a = b, true;
return false;
}
#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"
/*END OF TEMPLATE. ICEBEAR AND THE CAT WILL WIN VOI26 */
const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 2e5 + 5;
int n, q, S, T;
ll a[N];
void init(void) {
cin >> n >> q >> S >> T;
FOR(i, 0, n) cin >> a[i];
}
void process(void) {
FOR(i, 0, n - 1) a[i] = a[i] - a[i + 1];
ll res = 0;
FOR(i, 0, n - 1) res += 1LL * a[i] * (a[i] > 0 ? T : S);
while(q--) {
int l, r, x;
cin >> l >> r >> x;
res -= 1LL * a[l - 1] * (a[l - 1] > 0 ? T : S);
a[l - 1] -= x;
res += 1LL * a[l - 1] * (a[l - 1] > 0 ? T : S);
if (r < n) {
res -= 1LL * a[r] * (a[r] > 0 ? T : S);
a[r] += x;
res += 1LL * a[r] * (a[r] > 0 ? T : S);
}
cout << res << '\n';
}
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
if (fopen(task".inp", "r")) {
freopen(task".inp", "r", stdin);
freopen(task".out", "w", stdout);
}
int tc = 1;
// cin >> tc;
while(tc--) {
init();
process();
}
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
71 | freopen(task".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:72:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
72 | freopen(task".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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