Submission #937426

#	Time	Username	Problem	Language	Result	Execution time	Memory
937426		aaron_dcoder	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	98 ms	13136 KiB

foehn_phenomena

#define NDEBUG

#ifdef NDEBUG
#define dbg(TXTMSG) if constexpr (false) cerr << "lol"
#define dbgv(VARN) ((void)0)
#define dbgfor(COND) if constexpr (false) for (COND)

#else
#define _GLIBCXX_DEBUG 1
#define _GLIBCXX_DEBUG_PEDANTIC 1
#pragma GCC optimize("trapv")
#define dbg(TXTMSG) cerr << "\n" << TXTMSG
#define dbgv(VARN) cerr << "\n" << #VARN << " = "<< VARN  << ", line: " << __LINE__ << "\n"
#define dbgfor(COND) for (COND)

#endif

#include <bits/stdc++.h>
using namespace std;
using ll = long long; 
using pll = pair<ll,ll>;
#define e0 first
#define e1 second
constexpr ll INFTY = 2e18;

int main() 
{
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	ll N,Q,S,T;
	cin >> N >> Q >> S >> T;
	S *= -1;
	T *= -1;

	vector<ll> A(N+1);
	for (ll i = 0; i < N+1; ++i)
	{
		cin >> A[i];
	}

	vector<ll> pdiff(N);
	ll currans=0;
	for (ll i = 0; i < N; ++i)
	{
		pdiff[i]=A[i+1]-A[i];
		if (pdiff[i]>0)
		{
			currans += S*pdiff[i];
		}
		else {
			currans += T*pdiff[i];
		}
	}
dbg("h");
	for (ll qno = 0; qno < Q; qno++)
	{
		ll L, R , X;
		cin >> L >> R >> X;
		dbg(L << " " << R << " " << X);

		if (pdiff[L-1]>0)
		{
			currans -= S*pdiff[L-1];
		}
		else {
			currans -= T*pdiff[L-1];
		}
		if (R<N){
		if (pdiff[R]>0)
		{
			currans -= S*pdiff[R];
		}
		else {
			currans -= T*pdiff[R];
		}}

		pdiff[L-1] += X;
		if (R<N) pdiff[R] -= X;

		if (pdiff[L-1]>0)
		{
			currans += S*pdiff[L-1];
		}
		else {
			currans += T*pdiff[L-1];
		}

		if (R<N){
		if (pdiff[R]>0)
		{
			currans += S*pdiff[R];
		}
		else {
			currans += T*pdiff[R];
		}}

		cout << currans << "\n";


	}
}

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