Submission #1254641

#	Time	Username	Problem	Language	Result	Execution time	Memory
1254641		hoa208	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	89 ms	7276 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
#define t_test int t;cin >> t;while(t--)
const   ll mod = 1e9 + 7;
const   ll INF = 1e18;
inline  void adm(ll &x){if(x>=mod)x%=mod;else if(x<0)x+=mod;}
//--------------------------------------------------------------------
ll S, T, n, q;
ll calc(ll x, ll y) {
    if(x < y) {
        return (x - y) * S;
    }
    return (x - y) * T;
}
const ll N = 2e5 + 10;
ll a[N];
const int maxbit = 2e5 + 10;
ll BIT[maxbit];
void update(int x, ll val, int _n) {
    while(x <= _n) {
       BIT[x] += val;
       x += x & -x; 
    }
}
ll get(int x) {
    x++;
    ll res = 0;
    while(x > 0) {
        res += BIT[x];
        x -= x & -x;
    }
    return res;
}
void update_lr(int l, int r, ll val, int _n) {
    l++,r++;
    update(l, val, _n);
    update(r + 1, -val, _n);
}
int walk(int x, int _n) {
    int pos = 0;
    int LG = __lg(_n);
    FORD(j, LG, 0) {
        if(pos + (1 << j) <= _n && BIT[pos + (1 << j)] < x) {
            pos += (1 << j);
            x -= BIT[pos];
        }
    }
    return pos + 1;
}
void hbmt() {
    cin >> n >> q >> S >> T;
    FOR(i, 0, n) {
        cin >> a[i];
        update_lr(i, i, a[i], n + 1);
    }
    ll res = 0;
    FOR(i, 1, n) {
        res += calc(a[i - 1], a[i]);
    }
    FOR(i, 1, q) {
        ll l, r, x;
        cin >> l >> r >> x;
        res -= calc(get(l - 1), get(l));
        if(r + 1 <= n)
            res -= calc(get(r), get(r + 1));
        update_lr(l, r, x, n + 1);
        res += calc(get(l - 1), get(l));
        if(r + 1 <= n) {
            res += calc(get(r), get(r + 1));
        }
        cout << res << '\n';
    }
    
}

int main() {
    
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    
    if(fopen("hbmt.inp", "r")) {
        freopen("hbmt.inp", "r", stdin);
        freopen("hbmt.out", "w", stdout);
    }
    
    // t_test 
    hbmt();
    return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen("hbmt.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen("hbmt.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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