Submission #160303

#	Time	Username	Problem	Language	Result	Execution time	Memory
160303		12tqian	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	727 ms	13304 KiB

foehn_phenomena

#pragma GCC optimize ("O3")
#pragma GCC optimize ("Ofast")
#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;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

const double PI = 4 * atan(1);

#define sz(x) (int)(x).size()
#define ll long long
#define ld long double
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define vi vector<int>
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define vpi vector<pair<int, int>>
#define vpd vector<pair<double, double>>
#define pd pair<double, double>

#define f0r(i,a) for(int i=0;i<a;i++)
#define f1r(i,a,b) for(int i=a;i<b;i++)
#define trav(a, x) for (auto& a : x)

template<typename A, typename B> ostream& operator<<(ostream &cout, pair<A, B> const &p) { return cout << "(" << p.f << ", " << p.s << ")"; }
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v) {
  cout << "["; for(int i = 0; i < v.size(); i++) {if (i) cout << ", "; cout << v[i];} return cout << "]";
}

void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
}
void io(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
    fast_io();
}
const int MAX = 2e5 + 5;
ll a[MAX];
ll diff[MAX];
int main(){
    fast_io();
    ll n, q, s, t;
    cin >> n >> q >> s >> t;
    f0r(i, n+1){
        cin >> a[i];
        if(i != 0) diff[i] = a[i] - a[i-1];
    }
    ll ans = 0;
    f0r(i, n){
        if(a[i] < a[i+1]){
            ans -= s*(a[i+1] - a[i]);
        }
        else{
            ans += t*(a[i] - a[i+1]);
        }
    }
    while(q--){
        int l, r, x;
        cin >> l >> r >> x;
        ll d1 = diff[l];
        ll d2 = diff[r+1];
        if(l != 0){
            diff[l] += x;
        }
        diff[r+1] -= x;
        if(l != 0){
            if(d1>0){
                ans += s*(d1);
            }
            else{
                ans += t*(d1);
            }
            if(d1+x>0){
                ans -= s*(d1+x);
            }
            else{
                ans -= t*(d1+x);
            }
        }
        if(r != n){
            if(d2>0){
                ans += s*(d2);
            }
            else{
                ans += t*(d2);
            }
            if(d2-x>0){
                ans -= s*(d2-x);
            }
            else{
                ans -= t*(d2-x);
            }
        }
        cout << ans << endl;

    }
    return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'void io(std::__cxx11::string)':
foehn_phenomena.cpp:49:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FIN, "r", stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:50:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FOUT, "w", stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~

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