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답안 #212400

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
212400 2020-03-22T21:38:47 Z gs14004 별자리 3 (JOI20_constellation3) C++17
100 / 100
 572 ms 95224 KB 
#include <bits/stdc++.h>
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(), (v).end()
using namespace std;
using lint = long long;
using pi = pair<lint, lint>;
const int MAXN = 200005;
const int MAXT = 530000;

namespace gugugu{
	struct path{
		int cost, s, e;
	};

	int n, m;
	vector<int> gph[MAXN];
	vector<path> paths[MAXN];
	int par[MAXN][18], dep[MAXN];

	int dfn[MAXN], sz[MAXN], p0, tra[MAXN];
	int comp[MAXN], cnum[MAXN], chead[MAXN], csize[MAXN], piv;
	int son[MAXN];

	int lca(int x, int y){
		if(dep[x] > dep[y]) swap(x,y);
		int diff = dep[y] - dep[x];
		for (int i=0; i<18; i++) {
			if((diff >> i) & 1) y = par[y][i];
		}
		for (int i=17; i>=0; i--) {
			if(par[x][i] != par[y][i]){
				x = par[x][i];
				y = par[y][i];
			}
		}
		if(x == y) return x;
		return par[x][0];
	}

	void dfs(int pos, int pa){
		dfn[pos] = ++p0;
		tra[dfn[pos]] = pos;
		par[pos][0] = pa;
		dep[pos] = dep[pa] + 1;
		for (int i=1; i<18; i++) {
			par[pos][i] = par[par[pos][i-1]][i-1];
		}
		for (auto &x : gph[pos]){
			if(x == pa) continue;
			dfs(x,pos);
			sz[pos] += sz[x];
		}
		sz[pos]++;
	}

	void hld(int pos){
		comp[pos] = piv;
		cnum[pos] = ++csize[piv];
		int pmax = -1, vmax = -1;
		for (int i=0; i<gph[pos].size(); i++) {
			if(gph[pos][i] == par[pos][0]) continue;
			if(vmax < sz[gph[pos][i]]){
				vmax = sz[gph[pos][i]];
				pmax = i;
			}
		}
		if(pmax == -1) return;
		son[pos] = gph[pos][pmax];
		hld(gph[pos][pmax]);
		for (int i=0; i<gph[pos].size(); i++) {
			if(gph[pos][i] == par[pos][0] || i == pmax) continue;
			piv++;
			chead[piv] = gph[pos][i];
			hld(gph[pos][i]);
		}
	}

	lint dp[MAXN], sum[MAXN];
	lint mark[MAXN];
	vector<lint> psum[MAXN];

	lint getsum(int num, int s, int e){
		if(s > e) return 0;
		return psum[num][s] - psum[num][e+1];
	}

	lint f(int x, int y, int l){
		lint ret = 0;
		while (comp[x] != comp[l]) {
			ret += getsum(comp[x],1,cnum[x]);
			x = par[chead[comp[x]]][0];
		}
		ret += getsum(comp[l],cnum[l]+1,cnum[x]);
		while (comp[y] != comp[l]) {
			ret += getsum(comp[y],1,cnum[y]);
			y = par[chead[comp[y]]][0];
		}
		ret += getsum(comp[l],cnum[l]+1,cnum[y]);
		ret += sum[l];
		return ret;
	}

	void solve(){
		for (int i=n; i; i--) {
			lint pos = tra[i];
			for (auto &j : gph[pos]){
				if(j == par[pos][0]) continue;
				sum[pos] += dp[j];
			}
			lint ret = sum[pos];
			for (auto &j : paths[pos]){
				ret = max(ret,f(j.s,j.e,pos) + j.cost);
			}
			dp[pos] = ret;
			ret = sum[pos] - dp[pos];
			psum[comp[pos]][cnum[pos]] = psum[comp[pos]][cnum[pos]+1] + ret;
		}
	}

	void init(int _n, int _m){
		n = _n; m = _m;
	}
	void add_edge(int x, int y){
		gph[x].push_back(y);
		gph[y].push_back(x);
	}
	void proc1(){
		dfs(1, 0);
	}
	void add_path(int x, int y, int c){
		int l = lca(x,y);
		paths[l].push_back({c,x,y});
	}
	lint proc2(){
		piv = 1;
		hld(1);
		for (int i=1; i<=piv; i++) {
			psum[i].resize(csize[i] + 2);
		}
		solve();
		return dp[1];
	}
}

struct seg{
	int lim;
	pi tree[MAXT];
	void init(int n, int *a = NULL){
		for(lim = 1; lim <= n; lim <<= 1);
		fill(tree, tree + MAXT, pi(-1e9, 1e9));
		if(a) for(int i=1; i<=n; i++) tree[i + lim] = pi(a[i], i);
		for(int i=lim; i>0; i--){
			tree[i] = max(tree[2*i], tree[2*i+1]);
		}
	}
	void upd(int x, pi v){
		x += lim;
		tree[x] = v;
		while(x > 1){
			x >>= 1;
			tree[x] = max(tree[2*x], tree[2*x+1]);
		}
	}
	pi query(int s, int e){
		s += lim;
		e += lim;
		pi ret(-1e9, 1e9);
		while(s < e){
			if(s%2 == 1) ret = max(ret, tree[s++]);
			if(e%2 == 0) ret = max(ret, tree[e--]);
			s >>= 1;
			e >>= 1;
		}
		if(s == e) ret = max(ret, tree[s]);
		return ret;
	}
}seg1, seg2;

struct star{
	int x, y, val, st, ed;
	bool operator<(const star &s)const{
		return x < s.x;
	}
}b[MAXN];

int n, m, a[MAXN];
int piv, danmal[MAXN];

void solve(int s, int e, int x, int p){
	if(s > e) return;
	piv++;
	auto k = seg1.query(s, e);
	danmal[k.second] = piv;
	if(p) gugugu::add_edge(p, piv);
	int lo = lower_bound(b + 1, b + m + 1, (star){s, -1, -1}) - b;
	int hi = upper_bound(b + 1, b + m + 1, (star){e, -1, -1}) - b - 1;
	while(true){
		auto qr = seg2.query(lo, hi);
		if(qr.first <= k.first) break;
		b[qr.second].st = piv;
		seg2.upd(qr.second, pi(-1e9, -1e9));
	}
	solve(s, k.second - 1, k.first, danmal[k.second]);
	solve(k.second + 1, e, k.first, danmal[k.second]);
}

int main(){
	scanf("%d",&n);
	for(int i=1; i<=n; i++) scanf("%d",&a[i]);
	gugugu::init(n, m);
	scanf("%d",&m);
	for(int i=1; i<=m; i++) scanf("%d %d %d",&b[i].x,&b[i].y,&b[i].val);
	sort(b + 1, b + m + 1);
	seg1.init(n, a);
	seg2.init(m);
	lint sum = 0;
	for(int i=1; i<=m; i++){
		sum += b[i].val;
		seg2.upd(i, pi(b[i].y, i));
	}
	solve(1, n, 1e9, 0);
	for(int i=1; i<=m; i++) b[i].ed = danmal[b[i].x];
	gugugu::proc1();
	for(int i=1; i<=m; i++) gugugu::add_path(b[i].st, b[i].ed, b[i].val);
	printf("%lld\n", sum - gugugu::proc2());
}

Compilation message

constellation3.cpp: In function 'void gugugu::hld(int)':
constellation3.cpp:60:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i=0; i<gph[pos].size(); i++) {
                 ~^~~~~~~~~~~~~~~~
constellation3.cpp:70:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i=0; i<gph[pos].size(); i++) {
                 ~^~~~~~~~~~~~~~~~
constellation3.cpp: In function 'int main()':
constellation3.cpp:208:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
constellation3.cpp:209:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1; i<=n; i++) scanf("%d",&a[i]);
                          ~~~~~^~~~~~~~~~~~
constellation3.cpp:211:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&m);
  ~~~~~^~~~~~~~~
constellation3.cpp:212:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1; i<=m; i++) scanf("%d %d %d",&b[i].x,&b[i].y,&b[i].val);
                          ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 31208 KB Output is correct
2 Correct 23 ms 31104 KB Output is correct
3 Correct 23 ms 31232 KB Output is correct
4 Correct 27 ms 31232 KB Output is correct
5 Correct 24 ms 31104 KB Output is correct
6 Correct 23 ms 31224 KB Output is correct
7 Correct 24 ms 31232 KB Output is correct
8 Correct 23 ms 31104 KB Output is correct
9 Correct 24 ms 31104 KB Output is correct
10 Correct 23 ms 31232 KB Output is correct
11 Correct 24 ms 31208 KB Output is correct
12 Correct 23 ms 31104 KB Output is correct
13 Correct 23 ms 31232 KB Output is correct
14 Correct 24 ms 31104 KB Output is correct
15 Correct 24 ms 31204 KB Output is correct
16 Correct 24 ms 31232 KB Output is correct
17 Correct 26 ms 31104 KB Output is correct
18 Correct 25 ms 31224 KB Output is correct
19 Correct 24 ms 31096 KB Output is correct
20 Correct 25 ms 31232 KB Output is correct
21 Correct 24 ms 31144 KB Output is correct
22 Correct 25 ms 31104 KB Output is correct

Subtask #2
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 31208 KB Output is correct
2 Correct 23 ms 31104 KB Output is correct
3 Correct 23 ms 31232 KB Output is correct
4 Correct 27 ms 31232 KB Output is correct
5 Correct 24 ms 31104 KB Output is correct
6 Correct 23 ms 31224 KB Output is correct
7 Correct 24 ms 31232 KB Output is correct
8 Correct 23 ms 31104 KB Output is correct
9 Correct 24 ms 31104 KB Output is correct
10 Correct 23 ms 31232 KB Output is correct
11 Correct 24 ms 31208 KB Output is correct
12 Correct 23 ms 31104 KB Output is correct
13 Correct 23 ms 31232 KB Output is correct
14 Correct 24 ms 31104 KB Output is correct
15 Correct 24 ms 31204 KB Output is correct
16 Correct 24 ms 31232 KB Output is correct
17 Correct 26 ms 31104 KB Output is correct
18 Correct 25 ms 31224 KB Output is correct
19 Correct 24 ms 31096 KB Output is correct
20 Correct 25 ms 31232 KB Output is correct
21 Correct 24 ms 31144 KB Output is correct
22 Correct 25 ms 31104 KB Output is correct
23 Correct 27 ms 31488 KB Output is correct
24 Correct 27 ms 31488 KB Output is correct
25 Correct 26 ms 31488 KB Output is correct
26 Correct 25 ms 31488 KB Output is correct
27 Correct 31 ms 31544 KB Output is correct
28 Correct 26 ms 31488 KB Output is correct
29 Correct 30 ms 31480 KB Output is correct
30 Correct 26 ms 31540 KB Output is correct
31 Correct 26 ms 31488 KB Output is correct
32 Correct 27 ms 31616 KB Output is correct
33 Correct 28 ms 31608 KB Output is correct
34 Correct 30 ms 31616 KB Output is correct
35 Correct 26 ms 31536 KB Output is correct
36 Correct 26 ms 31616 KB Output is correct
37 Correct 26 ms 31616 KB Output is correct
38 Correct 26 ms 31692 KB Output is correct
39 Correct 29 ms 31480 KB Output is correct
40 Correct 27 ms 31616 KB Output is correct
41 Correct 26 ms 31488 KB Output is correct
42 Correct 28 ms 31488 KB Output is correct
43 Correct 32 ms 31628 KB Output is correct
44 Correct 27 ms 31488 KB Output is correct

Subtask #3
65.0 / 65.0

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 31208 KB Output is correct
2 Correct 23 ms 31104 KB Output is correct
3 Correct 23 ms 31232 KB Output is correct
4 Correct 27 ms 31232 KB Output is correct
5 Correct 24 ms 31104 KB Output is correct
6 Correct 23 ms 31224 KB Output is correct
7 Correct 24 ms 31232 KB Output is correct
8 Correct 23 ms 31104 KB Output is correct
9 Correct 24 ms 31104 KB Output is correct
10 Correct 23 ms 31232 KB Output is correct
11 Correct 24 ms 31208 KB Output is correct
12 Correct 23 ms 31104 KB Output is correct
13 Correct 23 ms 31232 KB Output is correct
14 Correct 24 ms 31104 KB Output is correct
15 Correct 24 ms 31204 KB Output is correct
16 Correct 24 ms 31232 KB Output is correct
17 Correct 26 ms 31104 KB Output is correct
18 Correct 25 ms 31224 KB Output is correct
19 Correct 24 ms 31096 KB Output is correct
20 Correct 25 ms 31232 KB Output is correct
21 Correct 24 ms 31144 KB Output is correct
22 Correct 25 ms 31104 KB Output is correct
23 Correct 27 ms 31488 KB Output is correct
24 Correct 27 ms 31488 KB Output is correct
25 Correct 26 ms 31488 KB Output is correct
26 Correct 25 ms 31488 KB Output is correct
27 Correct 31 ms 31544 KB Output is correct
28 Correct 26 ms 31488 KB Output is correct
29 Correct 30 ms 31480 KB Output is correct
30 Correct 26 ms 31540 KB Output is correct
31 Correct 26 ms 31488 KB Output is correct
32 Correct 27 ms 31616 KB Output is correct
33 Correct 28 ms 31608 KB Output is correct
34 Correct 30 ms 31616 KB Output is correct
35 Correct 26 ms 31536 KB Output is correct
36 Correct 26 ms 31616 KB Output is correct
37 Correct 26 ms 31616 KB Output is correct
38 Correct 26 ms 31692 KB Output is correct
39 Correct 29 ms 31480 KB Output is correct
40 Correct 27 ms 31616 KB Output is correct
41 Correct 26 ms 31488 KB Output is correct
42 Correct 28 ms 31488 KB Output is correct
43 Correct 32 ms 31628 KB Output is correct
44 Correct 27 ms 31488 KB Output is correct
45 Correct 372 ms 73184 KB Output is correct
46 Correct 387 ms 72532 KB Output is correct
47 Correct 411 ms 72280 KB Output is correct
48 Correct 365 ms 73148 KB Output is correct
49 Correct 386 ms 71904 KB Output is correct
50 Correct 373 ms 71800 KB Output is correct
51 Correct 361 ms 72068 KB Output is correct
52 Correct 402 ms 72824 KB Output is correct
53 Correct 387 ms 72620 KB Output is correct
54 Correct 572 ms 89128 KB Output is correct
55 Correct 519 ms 84192 KB Output is correct
56 Correct 487 ms 81312 KB Output is correct
57 Correct 508 ms 79224 KB Output is correct
58 Correct 420 ms 80680 KB Output is correct
59 Correct 447 ms 80480 KB Output is correct
60 Correct 362 ms 95224 KB Output is correct
61 Correct 364 ms 72032 KB Output is correct
62 Correct 527 ms 89268 KB Output is correct
63 Correct 363 ms 71604 KB Output is correct
64 Correct 359 ms 70752 KB Output is correct
65 Correct 546 ms 89976 KB Output is correct
66 Correct 371 ms 71288 KB Output is correct