Submission #173417

#	Time	Username	Problem	Language	Result	Execution time	Memory
173417		dennisstar	Foehn Phenomena (JOI17_foehn_phenomena)	C++11	100 / 100	683 ms	18596 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define fi first
#define se second
#define ryan bear
#define all(V) ((V).begin()), ((V).end())
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef long double ld;
typedef vector<int> vim;
typedef vector<ll> vlm;

int N, Q; ll S, T;
ll A[1000010];
int L, R; ll X, now;

struct dt {
	ll ar[(1<<22)], lz[(1<<22)];
	void init() { for (int i=0; i<=N; i++) upd(i, i, A[i]); }
	ll get(int t, int s, int e, int i) {
		spread(i);
		if (s==e) return ar[i];
		int md=(s+e)/2;
		if (t<=md) return get(t, s, md, i*2);
		else return get(t, md+1, e, i*2+1);
	}
	void upd(int is, int ie, int s, int e, int i, ll val) {
		if (s>e) return ;
		if (is<=s&&e<=ie) { lz[i]+=val; return ; }
		int md=(s+e)/2;
		if (is<=md) upd(is, ie, s, md, i*2, val);
		if (md+1<=ie) upd(is, ie, md+1, e, i*2+1, val);
	}
	void spread(int i) {
		if (i<(1<<21)) lz[i*2]+=lz[i], lz[i*2+1]+=lz[i];
		ar[i]+=lz[i]; lz[i]=0;
	}
	void upd(int is, int ie, ll val) { upd(is, ie, 0, N, 1, val); }
	ll get(int t) { return get(t, 0, N, 1); }
}DS;

ll f(ll a, ll b) { return (a-b)*(a<b?S:T); }

int main() {
	scanf("%d %d %lld %lld", &N, &Q, &S, &T);
	for (int i=0; i<=N; i++) scanf("%lld", &A[i]);
	for (int i=1; i<=N; i++) now+=f(A[i-1], A[i]);
	DS.init();
	for (int i=0; i<Q; i++) {
		scanf("%d %d %lld", &L, &R, &X);
		
		now-=f(DS.get(L-1), DS.get(L));
		if (R!=N) now-=f(DS.get(R), DS.get(R+1));

		DS.upd(L, R, X);

		now+=f(DS.get(L-1), DS.get(L));
		if (R!=N) now+=f(DS.get(R), DS.get(R+1));

		printf("%lld\n", now);
	}
	return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:46:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %lld %lld", &N, &Q, &S, &T);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:47:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (int i=0; i<=N; i++) scanf("%lld", &A[i]);
                           ~~~~~^~~~~~~~~~~~~~~
foehn_phenomena.cpp:51:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %lld", &L, &R, &X);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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