Submission #1263529

#	Time	Username	Problem	Language	Result	Execution time	Memory
1263529		InvMOD	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	63 ms	7240 KiB

foehn_phenomena

#include<bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define pb push_back
#define eb emplace_back

#define vi vector<int>
#define pi pair<int,int>
#define sz(v) (int)(v).size()
#define all(v) (v).begin(), (v).end()
#define compact(v) (v).erase(unique(all(v)), (v).end())

template<class T> using upq = priority_queue<T, vector<T>, greater<T>>;
template<class T> int lwrbound(const vector<T>& a, const T& b, const int s = 0){return int(lower_bound(s + all(a), b) - a.begin());}
template<class T> int uprbound(const vector<T>& a, const T& b, const int s = 0){return int(upper_bound(s + all(a), b) - a.begin());}

#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define ROF(i, a, b) for(int i = (a); i >= (b); i--)
#define sumof(x) accumulate(all(x), 0ll)
#define dbg(x) "[" << #x " = " << (x) << "]"
#define el "\n"

using ll = long long;
using ld = long double;

template<class T> bool ckmx(T& a, const T b){return (a < b ? a = b, true : false);}
template<class T> bool ckmn(T& a, const T b){return (a > b ? a = b, true : false);}

const int N = 2e5 + 5;
const int MOD = 1e9 + 7;
const ll INF = numeric_limits<ll>::max() / 8;

#define int long long

void Main()
{
    int n, q, S, T; cin >> n >> q >> S >> T;

    vi a(n + 1); FOR(i, 0, n) cin >> a[i];

    vi dif(n + 1); FOR(i, 1, n) dif[i] = a[i] - a[i - 1];

    ll answer = 0;
    auto upd = [&](int x, int op) -> void{
        answer += 1ll * op * (dif[x] > 0 ? -S : +T) * abs(dif[x]);
    };
    FOR(i, 1, n) upd(i, +1);

    while(q--){
        int l,r,x; cin >> l >> r >> x;

        upd(l, -1), dif[l] += x, upd(l, +1);
        if(r < n){
            upd(r + 1, -1), dif[r + 1] -= x, upd(r + 1, +1);
        }

        cout << answer << el;
    }
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP", "r", stdin);
        freopen(name".OUT", "w", stdout);
    }

    int t = 1; while(t--) Main();
    return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int32_t 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(name".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(name".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60