#include <bits/stdc++.h>
#define rf(x) (x)=0;while(*p<48)p++;while(47<*p)(x)=((x)<<3)+((x)<<1)+(*p++&15);
//#define rf(x) (x)=0;while(*p<48)im=*p=='-';while(47<*p)(x)=((x)<<3)+((x)<<1)+(*p++&15);if(im)(x)=-(x);
#define pb push_back
#define eb emplace_back
#define sz(V) ((int)(V).size())
#define allv(V) ((V).begin()),((V).end())
#define befv(V) ((V)[(sz(V)-2)])
#define sorv(V) sort(allv(V))
#define revv(V) reverse(allv(V))
#define univ(V) (V).erase(unique(allv(V)),(V).end())
#define clv(V) (V).clear()
#define upmin(a,b) (a)=min((a),(b))
#define upmax(a,b) (a)=max((a),(b))
#define rb(x) ((x)&(-(x)))
#define cb(x) (x)=(!(x))
#define INF (0x3f3f3f3f)
#define INFLL (0x3f3f3f3f3f3f3f3fll)
#define INFST (0x7f7f7f7f)
#define INFLLST (0x7f7f7f7f7f7f7f7fll)
using namespace std;
typedef long long ll;
typedef __int128_t lll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, ll> pil;
typedef pair<ll, int> pli;
typedef pair<ld, ld> pdd;
typedef complex<ld> base;
const ld EPS = (ld)1e-7;
const ld PI = acos(0) * 2;
bool isZero(const ld& x) { return abs(x) <= EPS; }
int sign(const ld& x) { return isZero(x) ? 0 : (0 < x ? 1 : -1); }
ll gcd(ll a, ll b) { for(;b;a%=b,swap(a,b)){} return abs(a); }
pll operator + (const pll& a, const pll& b) { return pll(a.first+b.first, a.second+b.second); }
pll operator - (const pll& a, const pll& b) { return pll(a.first-b.first, a.second-b.second); }
pll operator * (const pll& a, const ll& b) { return pll(a.first*b, a.second*b); }
ll operator * (const pll& a, const pll& b) { return a.first*b.second - b.first*a.second; }
ll ccw(const pll& a, const pll& b, const pll& c) { return a*b + b*c + c*a; }
int rd(int s, int e) { return rand()%(e-s+1) + s; }
void fg(vector<int> G[], int a, int b) { G[a].pb(b); G[b].pb(a); }
void fg(vector<pii> G[], int a, int b, int c) { G[a].pb({b, c}); G[b].pb({a, c}); }
const int MAXN = 500005;
const int MAXX = 500005;
const int MX = 524288;
struct SEG {
SEG() { init(); }
int d[MX*2];
void init() { fill(d, d+MX*2, -INF); }
void upd(int x, int r) {
x += MX; d[x] = r;
for(x /= 2; x; x /= 2)
d[x] = max(d[x*2], d[x*2+1]);
}
int get(int s, int e) {
int r = -INF; for(s += MX, e += MX; s <= e; s /= 2, e /= 2) {
if(s&1) upmax(r, d[s++]);
if(~e&1) upmax(r, d[e--]);
} return r;
}
};
struct NOD {
NOD(int d = 0, int x = 0, int c = 0) : d(d), x(x), c(c) {}
int d, x, c;
bool operator < (const NOD &t) const {
if(d != t.d) return d < t.d;
return x < t.x;
}
};
SEG segu, segd, segiu, segid;
int dp[MAXN];
NOD nod[MAXN];
int SI[MAXX], EI[MAXX];
int N, CU, CD, SX;
int main() {
scanf("%d%d%d%d", &N, &CU, &CD, &SX);
for(int i = 1; i <= N; i++) {
int d, x, c;
scanf("%d%d%d", &d, &x, &c);
nod[i] = NOD(d, x, c);
}
nod[N+1] = NOD(0, SX, 0);
nod[N+2] = NOD(MAXX-1, SX, 0);
sort(nod+1, nod+N+3);
N += 2;
fill(SI, SI+MAXX, INF);
fill(EI, EI+MAXX, -INF);
for(int i = 1; i <= N; i++) {
upmin(SI[nod[i].d], i);
upmax(EI[nod[i].d], i);
}
segu.upd(SX, -CU * SX);
segd.upd(SX, CD * SX);
segiu.upd(1, -CU * SX);
segid.upd(1, CD * SX);
for(int t = 1, s, e; t < MAXX; t++) {
s = SI[t]; e = EI[t];
if(s > e) continue;
//printf("t=%d : %d %d\n", t, s, e);
for(int i = s; i <= e; i++) {
int &ret = dp[i];
if(SX <= nod[i].x) ret = nod[i].c - CD * (nod[i].x - SX);
else ret = nod[i].c - CU * (SX - nod[i].x);
upmax(ret, segu.get(nod[i].x+1, MAXX-1) + CU*nod[i].x + nod[i].c);
upmax(ret, segd.get(0, nod[i].x-1) - CD*nod[i].x + nod[i].c);
segu.upd(nod[i].x, ret - CU*nod[i].x);
segd.upd(nod[i].x, ret + CD*nod[i].x);
}
for(int i = s; i <= e; i++) {
segiu.upd(i, dp[i] - CU*nod[i].x);
segid.upd(i, dp[i] + CD*nod[i].x);
}
for(int i = s; i <= e; i++) {
int &ret = dp[i];
upmax(ret, segiu.get(i+1, e) + CU*nod[i].x + nod[i].c);
upmax(ret, segid.get(s, i-1) - CD*nod[i].x + nod[i].c);
}
for(int i = s; i <= e; i++) {
segu.upd(nod[i].x, dp[i] - CU*nod[i].x);
segd.upd(nod[i].x, dp[i] + CD*nod[i].x);
}
}
/*
for(int i = 1; i <= N; i++)
printf("%d : x=%d, c=%d :: %d\n", i, nod[i].x, nod[i].c, dp[i]);
*/
cout << dp[N] << endl;
return 0;
}
Compilation message
salesman.cpp: In function 'int main()':
salesman.cpp:87:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d%d", &N, &CU, &CD, &SX);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
salesman.cpp:90:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d", &d, &x, &c);
~~~~~^~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
24 ms |
26532 KB |
Output is correct |
| 2 |
Correct |
26 ms |
26532 KB |
Output is correct |
| 3 |
Correct |
24 ms |
26632 KB |
Output is correct |
| 4 |
Correct |
31 ms |
26708 KB |
Output is correct |
| 5 |
Correct |
28 ms |
26784 KB |
Output is correct |
| 6 |
Correct |
51 ms |
26932 KB |
Output is correct |
| 7 |
Correct |
95 ms |
27068 KB |
Output is correct |
| 8 |
Correct |
163 ms |
27116 KB |
Output is correct |
| 9 |
Correct |
215 ms |
27516 KB |
Output is correct |
| 10 |
Correct |
360 ms |
27912 KB |
Output is correct |
| 11 |
Correct |
430 ms |
27952 KB |
Output is correct |
| 12 |
Correct |
528 ms |
28420 KB |
Output is correct |
| 13 |
Correct |
638 ms |
28420 KB |
Output is correct |
| 14 |
Correct |
679 ms |
28792 KB |
Output is correct |
| 15 |
Correct |
608 ms |
28808 KB |
Output is correct |
| 16 |
Correct |
681 ms |
28808 KB |
Output is correct |
| 17 |
Incorrect |
23 ms |
28808 KB |
Output isn't correct |
| 18 |
Incorrect |
23 ms |
28808 KB |
Output isn't correct |
| 19 |
Incorrect |
25 ms |
28808 KB |
Output isn't correct |
| 20 |
Incorrect |
26 ms |
28808 KB |
Output isn't correct |
| 21 |
Incorrect |
28 ms |
28808 KB |
Output isn't correct |
| 22 |
Incorrect |
30 ms |
28808 KB |
Output isn't correct |
| 23 |
Incorrect |
32 ms |
28808 KB |
Output isn't correct |
| 24 |
Incorrect |
29 ms |
28808 KB |
Output isn't correct |
| 25 |
Incorrect |
151 ms |
28808 KB |
Output isn't correct |
| 26 |
Incorrect |
278 ms |
28808 KB |
Output isn't correct |
| 27 |
Incorrect |
447 ms |
28808 KB |
Output isn't correct |
| 28 |
Incorrect |
563 ms |
28808 KB |
Output isn't correct |
| 29 |
Incorrect |
683 ms |
28840 KB |
Output isn't correct |
| 30 |
Incorrect |
654 ms |
28840 KB |
Output isn't correct |
