제출 #781339

#제출 시각아이디문제언어결과실행 시간메모리
781339makanhuliaFoehn Phenomena (JOI17_foehn_phenomena)C++17
100 / 100
102 ms13144 KiB
#include <bits/stdc++.h> using namespace std; #define ll long long #define ull unsigned long long #define ld long double #define fi first #define se second ll a[200005], diff[200005]; int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); int n, q; cin >> n >> q; ll s, t; cin >> s >> t; s = -s, t = -t; ll ans = 0; for (int i = 0; i <= n; i++) cin >> a[i]; for (int i = 1; i <= n; i++) { diff[i] = a[i] - a[i - 1]; if (diff[i] > 0) ans += s * diff[i]; else ans += t * diff[i]; } while (q--) { int l, r; ll x; cin >> l >> r >> x; if (r == n) { if (diff[l] > 0) ans -= s * diff[l]; else ans -= t * diff[l]; diff[l] += x; if (diff[l] > 0) ans += s * diff[l]; else ans += t * diff[l]; cout << ans << "\n"; continue; } if (diff[l] > 0) ans -= s * diff[l]; else ans -= t * diff[l]; if (diff[r + 1] > 0) ans -= s * diff[r + 1]; else ans -= t * diff[r + 1]; diff[l] += x, diff[r + 1] -= x; if (diff[l] > 0) ans += s * diff[l]; else ans += t * diff[l]; if (diff[r + 1] > 0) ans += s * diff[r + 1]; else ans += t * diff[r + 1]; cout << ans << "\n"; } }
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