Submission #706401

#	Time	Username	Problem	Language	Result	Execution time	Memory
706401		Alihan_8	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	169 ms	13128 KiB

foehn_phenomena

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define int long long
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, q, S, _T;
    cin >> n >> q >> S >> _T;
    vector <int> p(n+1);
    for ( auto &i: p ) cin >> i;
    vector <int> bit(n+1);
    auto upd = [&](int i, int val){
        for (; i <= n; i += i&-i ) bit[i] += val;
    };
    auto get = [&](int i){
        int cnt = 0;
        for (; i > 0; i -= i&-i ) cnt += bit[i];
        return cnt;
    };
    int cnt = 0;
    for ( int i = 1; i <= n; i++ ){
        if ( p[i-1] < p[i] ) cnt -= S*(p[i]-p[i-1]);
        else cnt += _T*(-p[i]+p[i-1]);
        upd(i, p[i]), upd(i+1, -p[i]);
    }
    while ( q-- ){
        int l, r, x; cin >> l >> r >> x;
        if ( get(l) > get(l-1) ) cnt += S*(get(l)-get(l-1));
        else cnt -= _T*(-get(l)+get(l-1));
        if ( r+1 <= n ){
            if ( get(r+1) > get(r) ) cnt += S*(get(r+1)-get(r));
            else cnt -= _T*(get(r)-get(r+1));
        }
        upd(l, x), upd(r+1, -x);
        if ( get(l) > get(l-1) ) cnt -= S*(get(l)-get(l-1));
        else cnt += _T*(-get(l)+get(l-1));
        if ( r+1 <= n ){
            if ( get(r+1) > get(r) ) cnt -= S*(get(r+1)-get(r));
            else cnt += _T*(get(r)-get(r+1));
        }
        cout << cnt << ln;
    }


    cout << '\n';
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'void IO(std::string)':
foehn_phenomena.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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