Submission #56873

#	Time	Username	Problem	Language	Result	Execution time	Memory
56873		Benq	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	262 ms	169860 KiB

foehn_phenomena

#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;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)

#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

const int MOD = 1000000007;
const ll INF = 1e18;
const int MX = 100001;

int N,Q,S,T;
ll sum;
vl A, dif;

ll calc(int x) {
    if (dif[x] > 0) return -S*dif[x];
    return -T*dif[x];
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> N >> Q >> S >> T; A.resize(N+1);
    F0R(i,N+1) cin >> A[i];
    F0R(i,N) {
        dif.pb(A[i+1]-A[i]);
        sum += calc(i);
    }
    F0R(i,Q) {
        int L,R,X; cin >> L >> R >> X;
        if (L) {
            sum -= calc(L-1);
            dif[L-1] += X;
            sum += calc(L-1);
        }
        if (R < N) {
            sum -= calc(R);
            dif[R] -= X;
            sum += calc(R);
        }
        cout << sum << "\n";
    }
}

/* Look for:
* the exact constraints (multiple sets are too slow for n=10^6 :( ) 
* special cases (n=1?)
* overflow (ll vs int?)
* array bounds
*/

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