Submission #1159986

#	Time	Username	Problem	Language	Result	Execution time	Memory
1159986		hainam2k9	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	95 ms	6472 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define tt cin.tie(0), cout.tie(0), ios_base::sync_with_stdio(0)
#define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
#define ll long long
#define ull unsigned long long
#define i128 __int128
#define db long double
#define sz(a) ((int)(a).size())
#define pb emplace_back
#define pf emplace_front
#define pob pop_back
#define pof pop_front
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define ins emplace
#define mp make_pair
using namespace std;
const int MOD = 1e9+7, MAXN = 2e5+5;
const string NAME = "";
int n,q,s,t,a[MAXN];
ll bit[MAXN],cur=0;
void update(int pos, int val){
    while(pos<=n) bit[pos]+=val, pos+=pos&-pos;
}
ll sum(int pos){
    ll rs=0;
    while(pos>0) rs+=bit[pos], pos-=pos&-pos;
    return rs;
}
ll cost(ll L, ll R){
    if(L<R) return -s*(R-L);
    return t*(L-R);
}
int main()
{
    tt;
    if(fopen((NAME + ".INP").c_str(), "r")) fo;
    cin >> n >> q >> s >> t;
    for(int i = 0; i<=n; ++i){
        cin >> a[i];
        if(i==0) continue;
        update(i,a[i]-a[i-1]);
        cur+=cost(a[i-1],a[i]);
    }
    while(q--){
        int l,r,x;
        cin >> l >> r >> x;
        cur-=cost(sum(l-1),sum(l));
        if(r<n) cur-=cost(sum(r),sum(r+1));
        update(l,x), update(r+1,-x);
        cur+=cost(sum(l-1),sum(l));
        if(r<n) cur+=cost(sum(r),sum(r+1));
        cout << cur << "\n";
    }
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:3:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:39:45: note: in expansion of macro 'fo'
   39 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~
foehn_phenomena.cpp:3:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |                                                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:39:45: note: in expansion of macro 'fo'
   39 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~

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