oj.uz

답안 #937770

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
937770 2024-03-04T12:51:23 Z WonderfulWhale Designated Cities (JOI19_designated_cities) C++17
23 / 100
 2000 ms 107460 KB 
#include<bits/stdc++.h>
using namespace std;

#define int int64_t
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()

const int MAXN = 200'009;
const int INF = 1e18;

struct SegTree {
	const static int T = 1<<19;
	pii t[2*T];
	int lz[2*T];
	void push(int v) {
		t[2*v].st += lz[v];
		lz[2*v] += lz[v];
		t[2*v+1].st += lz[v];
		lz[2*v+1] += lz[v];
		lz[v] = 0;
	}
	void update(int l, int r, int val, int tl=0, int tr=T-1, int v=1) {
		//if(v==1) cerr << l << " " << r << " " << val << "\n";
		if(l>r) return;
		if(l==tl&&r==tr) {
			//cerr << "adding: " << v << " " << val << "\n";
			t[v].st += val;
			lz[v] += val;
			//cerr << "new: " << t[v] << "\n";
			return;
		}
		int tm = (tl+tr)/2;
		push(v);
		update(l, min(r, tm), val, tl, tm, 2*v);
		update(max(l, tm+1), r, val, tm+1, tr, 2*v+1);
		t[v] = max(t[2*v], t[2*v+1]);
	}
	pii query(int l, int r, int tl=0, int tr=T-1, int v=1) {
		//cerr << "query: " << l <<  " " << r << " " << v << " "<<t[v] << "\n";
		if(l>r) return {-INF, -1};
		if(l==tl&&r==tr) return t[v];
		int tm = (tl+tr)/2;
		push(v);
		return max(query(l, min(r, tm), tl, tm, 2*v),
				query(max(l, tm+1), r, tm+1, tr, 2*v+1));
	}
} seg, seg1, seg2;

int n;
vector<pair<int, pii>> G[MAXN];
int tin[MAXN], tout[MAXN], T;
int sum[MAXN];
int heavy[MAXN];
int head[MAXN];
int pos[MAXN], P;
int par[MAXN];
pii cost[MAXN];

pii dp[MAXN];

void dfs(int x, int p=-1) {
	par[x] = p;
	tin[x] = ++T;
	seg.t[tin[x]+seg.T].nd = x;
	seg.update(tin[x], tin[x], INF);
	for(auto [y, c]:G[x]) {
		if(y==p) 
			continue;
		cost[y] = c;
		sum[x] += c.nd;
		dfs(y, x);
		sum[x] += sum[y];
	}
	tout[x] = ++T;
	seg.t[tout[x]+seg.T].nd = x;
	seg.update(tout[x], tout[x], INF);
	for(auto [y, c]:G[x]) {
		if(y==p) continue;
		//cerr << "updates: " << x << " " << y << "\n";
		seg.update(tin[y], tout[y], c.st);
		seg.update(1, tin[y]-1, c.nd);
		seg.update(tout[y]+1, 2*n, c.nd);
	}
}

pair<int, pii> start;

void dfs2(int x, int p=-1, int s=0) {
	pii best[2];
	best[0] = {0, x};
	best[1].st = -INF;
	for(auto [y, c]:G[x]) {
		if(y==p) continue;
		dfs2(y, x, s+c.st+sum[x]-sum[y]-c.nd);
		int val = dp[y].st+c.st+c.nd-sum[y]-c.nd;
		if(val>=best[0].st) {
			best[1] = best[0];
			best[0] = {val, dp[y].nd};
		} else if(val>=best[1].st) {
			best[1] = {val, dp[y].nd};
		}
	}
	start = max(start, {best[0].st+best[1].st+s+sum[x], 
			{best[0].nd, best[1].nd}});
	dp[x] = {sum[x], x};
	for(auto [y, c]:G[x]) {
		if(y==p) continue;
		dp[x] = max(dp[x], 
				{dp[y].st+c.st+c.nd+sum[x]-sum[y]-c.nd, dp[y].nd});
	}
}

int dfs3(int x, int p=-1) {
	int s = 1;
	int max_s = 0;
	for(auto [y, c]:G[x]) {
		if(y==p) continue;
		int c_s = dfs3(y, x);
		s += c_s;
		if(c_s>max_s) {
			max_s = c_s;
			heavy[x] = y;
		}
	}
	return s;
}

void decompose(int x, int h, int p=-1) {
	head[x] = h;
	pos[x] = P++;
	if(heavy[x]!=0)
		decompose(heavy[x], h, x);
	for(auto [y, c]:G[x]) {
		if(y!=p&&y!=heavy[x])
			decompose(y, y, x);
	}
	//cerr << "hld: " << x << "->" << pos[x] << "\n";
}

int ans[MAXN];

void erase_e(int x, int type) {
	//cerr << "erasing edge: " << x << " " << type << "\n";
	if(type==0) {
		seg.update(1, tin[x]-1, -cost[x].nd);
		seg.update(tout[x]+1, 2*n, -cost[x].nd);
		seg1.update(pos[x], pos[x], -INF);
	}
	if(type==1) {
		seg.update(tin[x], tout[x], -cost[x].st);
		seg2.update(pos[x], pos[x], -INF);
	}
}

void erase_v(int x) {
	//cerr << "erasing v: " << x << "\n";
	seg.update(tin[x], tin[x], -INF);
	seg.update(tout[x], tout[x], -INF);
	vector<pii> segments;
	int cur = x;
	while(cur!=-1) {
		segments.pb({pos[head[cur]], pos[cur]});
		cur = par[head[cur]];
	}
	reverse(all(segments));
	for(pii x:segments) {
		//cerr << x.st << " " << x.nd << "\n";
	}
	int pre = 0;
	for(pii x:segments) {
		pii y = seg1.query(pre, x.st-1);
		//cerr << "querying: "<< pre << " " << x.st-1 << "\n";
		while(y.st>0) {
			erase_e(y.nd, 0);
			y = seg1.query(pre, x.st-1);
		}
		pre = x.nd+1;
	}
	pii Y = seg1.query(pre, n);
	while(Y.st>0) {
		erase_e(Y.nd, 0);
		Y = seg1.query(pre, n);
	}
	for(pii x:segments) {
		pii y = seg2.query(x.st, x.nd);
		while(y.st>0) {
			erase_e(y.nd, 1);
			y = seg2.query(x.st, x.nd);
		}
	}
}

int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

	for(int i=0;i<2*seg.T;i++) {
		seg.t[i].st = -INF;
	}

	cin >> n;
	int S = 0;
	for(int i=0;i<n-1;i++) {
		int a, b, c, d;
		cin >> a >> b >> c >> d;
		S += c+d;
		G[a].pb({b, {c, d}});
		G[b].pb({a, {d, c}});
	}
	dfs(1);
	dfs2(1);
	dfs3(1);
	decompose(1, 1);
	for(int i=2;i<=n;i++) {
		seg1.t[pos[i]+seg1.T].nd = i;
		seg1.update(pos[i], pos[i], cost[i].nd);
		seg2.t[pos[i]+seg2.T].nd = i;
		seg2.update(pos[i], pos[i], cost[i].nd);
	}
	//cerr << "cos: " << tin[2] << "\n";
	ans[1] = seg.query(1, 2*n).st;
	ans[2] = start.st;
	erase_v(start.nd.st);
	erase_v(start.nd.nd);
	for(int i=3;i<=n;i++) {
		//cerr << seg.query(tin[2], tin[2]).st << " xd\n";
		//cerr << seg.query(tin[0], tin[0]).st << " xd\n";
		pii x = seg.query(1, 2*n);
		//cerr << "New year, new me " << x.nd << "\n";
		//cerr << "with some weird value: " << x.st << "\n";
		ans[i] = ans[i-1] + x.st;
		erase_v(x.nd);
	}
	int q;
	cin >> q;
	while(q--) {
		int x;
		cin >> x;
		cout << S-ans[x] << "\n";
	}
}

Compilation message

designated_cities.cpp: In function 'void erase_v(int64_t)':
designated_cities.cpp:170:10: warning: variable 'x' set but not used [-Wunused-but-set-variable]
  170 |  for(pii x:segments) {
      |          ^

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 59984 KB Output is correct
2 Correct 11 ms 59996 KB Output is correct
3 Correct 10 ms 59996 KB Output is correct
4 Correct 11 ms 60356 KB Output is correct
5 Correct 11 ms 59996 KB Output is correct
6 Correct 10 ms 59996 KB Output is correct
7 Correct 10 ms 59996 KB Output is correct
8 Correct 10 ms 59924 KB Output is correct
9 Correct 9 ms 59996 KB Output is correct
10 Correct 10 ms 59996 KB Output is correct
11 Correct 9 ms 59996 KB Output is correct

Subtask #2
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 59992 KB Output is correct
2 Execution timed out 2035 ms 107316 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 59996 KB Output is correct
2 Execution timed out 2066 ms 107460 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 59984 KB Output is correct
2 Correct 11 ms 59996 KB Output is correct
3 Correct 10 ms 59996 KB Output is correct
4 Correct 11 ms 60356 KB Output is correct
5 Correct 11 ms 59996 KB Output is correct
6 Correct 10 ms 59996 KB Output is correct
7 Correct 10 ms 59996 KB Output is correct
8 Correct 10 ms 59924 KB Output is correct
9 Correct 9 ms 59996 KB Output is correct
10 Correct 10 ms 59996 KB Output is correct
11 Correct 9 ms 59996 KB Output is correct
12 Correct 9 ms 59996 KB Output is correct
13 Correct 23 ms 60512 KB Output is correct
14 Correct 21 ms 60764 KB Output is correct
15 Correct 23 ms 60760 KB Output is correct
16 Correct 24 ms 60508 KB Output is correct
17 Correct 23 ms 60508 KB Output is correct
18 Correct 31 ms 60548 KB Output is correct
19 Correct 23 ms 60508 KB Output is correct
20 Correct 23 ms 60508 KB Output is correct
21 Correct 23 ms 60508 KB Output is correct
22 Correct 23 ms 60508 KB Output is correct
23 Correct 23 ms 60508 KB Output is correct
24 Correct 22 ms 60524 KB Output is correct
25 Correct 21 ms 60764 KB Output is correct
26 Correct 22 ms 60492 KB Output is correct

Subtask #5
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 59992 KB Output is correct
2 Execution timed out 2035 ms 107316 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #6
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 59984 KB Output is correct
2 Correct 11 ms 59996 KB Output is correct
3 Correct 10 ms 59996 KB Output is correct
4 Correct 11 ms 60356 KB Output is correct
5 Correct 11 ms 59996 KB Output is correct
6 Correct 10 ms 59996 KB Output is correct
7 Correct 10 ms 59996 KB Output is correct
8 Correct 10 ms 59924 KB Output is correct
9 Correct 9 ms 59996 KB Output is correct
10 Correct 10 ms 59996 KB Output is correct
11 Correct 9 ms 59996 KB Output is correct
12 Correct 10 ms 59992 KB Output is correct
13 Execution timed out 2035 ms 107316 KB Time limit exceeded
14 Halted 0 ms 0 KB -