Submission #924676

#	Time	Username	Problem	Language	Result	Execution time	Memory
924676		Baizho	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	247 ms	17024 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
  
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
 
 #pragma GCC optimize("Ofast,unroll-loops,fast-math")
 #pragma GCC target("popcnt")
 
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll,ll> pll;
 
#define sz size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define pb push_back
 
const int mod = ll(1e9)+7; //(b + (a%b)) % b (to mod -1%(10^9+7) correctly in c++ its -1 but its suppose to be 10^9+6
const ll MOD = 998244353;  // (a%mod)*(binpow(b,mod-2,mod) = (a/b)%mod
const int N = ll(2e5)+100;
const int M = ll(2e5) + 100;
const long long inf = 5e18;
const long double eps = 1e-15L;
 
ll lcm(ll a, ll b) { return (a / __gcd(a,b))*b; }
 
ll binpow(ll a, ll b, ll m) { ll res=1; a %= m; while(b>0){ if(b&1)res=(res * a) % m; a=(a * a) % m; b/=2; } return res%m;}
 
void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }

int n, q, s, t, a[N];
long long ans = 0, u[N * 4];

long long val(long long x, long long y, int p) {
	if(p == n + 1) return 0;
	if(x < y) return 1LL * (x - y) * s;
	return 1LL * (x - y) * t;
}

void update(int v, int tl, int tr, int l, int r, int x) {
	if(tl > r || l > tr) return;
	if(l <= tl && tr <= r) {
		u[v] += x;
		return;
	}
	int tm = (tl + tr) / 2;
	update(v + v, tl, tm, l, r, x);
	update(v + v + 1, tm + 1, tr, l, r, x);
}

long long get(int v, int tl, int tr, int p) {
	if(tl == tr) return u[v];
	int tm = (tl + tr) / 2;
	if(p <= tm) return get(v + v, tl, tm, p) + u[v];
	else return get(v + v + 1, tm + 1, tr, p) + u[v];
}


void Baizho() {
	cin>>n>>q>>s>>t;
	for(int i = 0; i <= n; i ++) {
		cin>>a[i];
		update(1, 0, n, i, i, a[i]);
	}
	for(int i = 0; i < n; i ++) {
		ans += val(a[i], a[i + 1], i + 1);
	}
	while(q --) {
		int l, r, x; cin>>l>>r>>x;
		long long v1 = get(1, 0, n, l - 1), v2 = get(1, 0, n, l), v3 = get(1, 0, n, r), v4 = get(1, 0, n, r + 1);
		ans = ans - val(v1, v2, l) - val(v3, v4, r + 1) + val(v1, v2 + x, l) + val(v3 + x, v4, r + 1);
		update(1, 0, n, l, r, x);
		cout<<ans<<"\n";
	}
}
 
signed main() {		
// 	Freopen("nondec");
    ios_base::sync_with_stdio(false);   
    cin.tie(0);cout.tie(0); 
//   	precalc();
   	
    int ttt = 1;
//    cin>>ttt;
 
    for(int i=1; i<=ttt; i++) {Baizho(); }
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'void Freopen(std::string)':
foehn_phenomena.cpp:35:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:35:76: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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