oj.uz

Submission #755325

# Submission time Handle Problem Language Result Execution time Memory
755325 2023-06-09T20:56:07 Z jmyszka2007 Election Campaign (JOI15_election_campaign) C++17
100 / 100
 284 ms 41332 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define st first
#define nd second
#define pi pair<int, int>
#define pb push_back
struct sc {
	int s1, s2, val, a, b;
};
constexpr int LIM = 1e5;
constexpr int base = (1 << 17);
vector<int>g[LIM + 10];
int pre[LIM + 10];
int post[LIM + 10];
int nxt[LIM + 10][18];
ll dp[LIM + 10][2];
vector<sc>zap[LIM + 10];
ll tri[2 * base][2];
int ojhld[LIM + 10];
int siz[LIM + 10];
bool czy(int a, int b) {
	return pre[a] <= pre[b] && post[a] >= post[b];
}
pair<int, pi> lca(int a, int b) {
	if(pre[a] <= pre[b]) {
		swap(a, b);
	}
	for(int i = 17; i >= 0; i--) {
		if(!czy(nxt[a][i], b)) {
			a = nxt[a][i];
		}
	}
	if(nxt[a][0] == b) {
		return {nxt[a][0], {a, 0}};
	}
	for(int i = 17; i >= 0; i--) {
		if(!czy(nxt[b][i], a)) {
			b = nxt[b][i];
		}
	}
	return {nxt[a][0], {a, b}};	
}
void prepare(int v, int o) {
	siz[v] = 1;
	int mx = 0;
	for(auto x : g[v]) {
		if(x != o) {
			prepare(x, v);
			siz[v] += siz[x];
			mx = max(mx, siz[x]);
		}
	}
	for(int i = 0; i < g[v].size(); i++) {
		if(g[v][i] != o && siz[g[v][i]] == mx) {
			swap(g[v][i], g[v][0]);
		}
	}
}
int aktpre = 1, aktpost = 1;
void dfs(int v, int o) {
	pre[v] = aktpre++;
	nxt[v][0] = o;
	for(int i = 1; i <= 17; i++) {
		nxt[v][i] = nxt[nxt[v][i - 1]][i - 1];
	}
	for(int i = 0; i < g[v].size(); i++) {
		if(g[v][i] != o) {
			if(i) {
				ojhld[g[v][i]] = g[v][i];
			}
			else {
				ojhld[g[v][i]] = ojhld[v];
			}
			dfs(g[v][i], v);
		}
	}
	post[v] = aktpost++;
}
void upd(int v, ll x, int k) {
	v += base;
	tri[v][k] = x;
	v /= 2;
	while(v > 0) {
		tri[v][k] = tri[2 * v][k] + tri[2 * v + 1][k];
		v /= 2;
	}
}
ll que(int l, int r, int k) {
	l += base;
	r += base;
	ll ans = 0;
	while(l <= r) {
		if(l & 1) {
			ans += tri[l][k];
		}
		if(!(r & 1)) {
			ans += tri[r][k];
		}
		l = (l + 1) / 2;
		r = (r - 1) / 2;
	}
	return ans;
}
ll hld(int a, int b, int k) {
	//cout << "\nHLD " << a << ' ' << b << ' ' << k << '\n';
	ll ans = 0;
	while(pre[a] >= pre[b]) {
		if(pre[ojhld[a]] <= pre[b]) {
			//cout << a << ' ' << b << ' ' << que(pre[b], pre[a], k) << '\n';
			ans += que(pre[b], pre[a], k);
			break;
		}
		else {
			//cout << a << ' ' << ojhld[a] << ' ' << que(pre[ojhld[a]], pre[a], k) << '\n';;
			ans += que(pre[ojhld[a]], pre[a], k);
			a = nxt[ojhld[a]][0];
		}
	}
	//cout << "KONIEC\n";
	return ans;
}
void cntdp(int v, int o) {
	int sum = 0;
	for(auto x : g[v]) {
		if(x != o) {
			cntdp(x, v);
			sum += max(dp[x][0], dp[x][1]);
		}
	}
	dp[v][0] = sum;
	upd(pre[v], dp[v][0], 0);
	for(auto x : zap[v]) {
		if(x.b == v) {
			//cout << x.a << ' ' << x.b << ' ' << v << ' ' << x.val << ' ' <<  hld(x.a, v, 0) << ' ' << hld(x.a, x.s1, 1) << '\n';
			dp[v][1] = max(dp[v][1], hld(x.a, v, 0) - hld(x.a, x.s1, 1) + x.val);
		}
		else {
			//cout << v << ' ' << x.a << ' ' << x.b << ' ' << x.val << ' ' << hld(x.a, v, 0) << ' ' << hld(x.a, x.s1, 1)  << ' '  << hld(x.b, x.s2, 1) << '\n';
			dp[v][1] = max(dp[v][1], hld(x.a, v, 0) - hld(x.a, x.s1, 1) + hld(x.b, x.s2, 0) - hld(x.b, x.s2, 1) + x.val);
		}
	}
	//cout << v << ' ' << dp[v][0] << ' ' << dp[v][1] << '\n';
	upd(pre[v], max(dp[v][0], dp[v][1]), 1);
}
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin >> n;
	for(int i = 1; i < n; i++) {
		int a, b;
		cin >> a >> b;
		g[a].push_back(b);
		g[b].push_back(a);
	}
	prepare(1, 1);	
	ojhld[1] = 1;
	dfs(1, 1);
	int t;
	cin >> t;
	for(int i = 1; i <= t; i++) {
		int a, b, x;
		cin >> a >> b >> x;
		pair<int, pi> tmp = lca(a, b);
		sc tmp2;
		if(pre[a] <= pre[b]) {
			swap(a, b);
		}
		tmp2.a = a;
		tmp2.b = b;
		tmp2.val = x;
		tmp2.s1 = tmp.nd.st;
		tmp2.s2 = tmp.nd.nd;
		zap[tmp.st].pb(tmp2);
	}
	cntdp(1, 1);
	cout << max(dp[1][0], dp[1][1]) << '\n';
}

Compilation message

election_campaign.cpp: In function 'void prepare(int, int)':
election_campaign.cpp:54:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |  for(int i = 0; i < g[v].size(); i++) {
      |                 ~~^~~~~~~~~~~~~
election_campaign.cpp: In function 'void dfs(int, int)':
election_campaign.cpp:67:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |  for(int i = 0; i < g[v].size(); i++) {
      |                 ~~^~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5040 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 4 ms 5204 KB Output is correct
5 Correct 117 ms 22704 KB Output is correct
6 Correct 57 ms 36644 KB Output is correct
7 Correct 100 ms 31824 KB Output is correct
8 Correct 82 ms 23048 KB Output is correct
9 Correct 113 ms 29024 KB Output is correct
10 Correct 80 ms 23088 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 4 ms 5036 KB Output is correct
3 Correct 4 ms 5332 KB Output is correct
4 Correct 144 ms 40924 KB Output is correct
5 Correct 170 ms 40936 KB Output is correct
6 Correct 160 ms 40956 KB Output is correct
7 Correct 154 ms 40984 KB Output is correct
8 Correct 160 ms 40940 KB Output is correct
9 Correct 136 ms 41012 KB Output is correct
10 Correct 143 ms 40956 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 4 ms 5036 KB Output is correct
3 Correct 4 ms 5332 KB Output is correct
4 Correct 144 ms 40924 KB Output is correct
5 Correct 170 ms 40936 KB Output is correct
6 Correct 160 ms 40956 KB Output is correct
7 Correct 154 ms 40984 KB Output is correct
8 Correct 160 ms 40940 KB Output is correct
9 Correct 136 ms 41012 KB Output is correct
10 Correct 143 ms 40956 KB Output is correct
11 Correct 16 ms 6480 KB Output is correct
12 Correct 153 ms 41304 KB Output is correct
13 Correct 146 ms 41300 KB Output is correct
14 Correct 130 ms 41220 KB Output is correct
15 Correct 165 ms 41292 KB Output is correct
16 Correct 129 ms 41232 KB Output is correct
17 Correct 155 ms 41304 KB Output is correct
18 Correct 151 ms 41224 KB Output is correct
19 Correct 134 ms 41252 KB Output is correct
20 Correct 145 ms 41212 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 229 ms 26520 KB Output is correct
2 Correct 136 ms 40996 KB Output is correct
3 Correct 253 ms 35496 KB Output is correct
4 Correct 163 ms 27100 KB Output is correct
5 Correct 228 ms 34572 KB Output is correct
6 Correct 141 ms 26884 KB Output is correct
7 Correct 272 ms 34192 KB Output is correct
8 Correct 196 ms 26820 KB Output is correct
9 Correct 147 ms 41020 KB Output is correct
10 Correct 249 ms 32464 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5040 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 4 ms 5204 KB Output is correct
5 Correct 117 ms 22704 KB Output is correct
6 Correct 57 ms 36644 KB Output is correct
7 Correct 100 ms 31824 KB Output is correct
8 Correct 82 ms 23048 KB Output is correct
9 Correct 113 ms 29024 KB Output is correct
10 Correct 80 ms 23088 KB Output is correct
11 Correct 4 ms 5304 KB Output is correct
12 Correct 4 ms 5460 KB Output is correct
13 Correct 4 ms 5332 KB Output is correct
14 Correct 4 ms 5332 KB Output is correct
15 Correct 4 ms 5332 KB Output is correct
16 Correct 4 ms 5352 KB Output is correct
17 Correct 4 ms 5332 KB Output is correct
18 Correct 4 ms 5304 KB Output is correct
19 Correct 4 ms 5332 KB Output is correct
20 Correct 4 ms 5432 KB Output is correct

Subtask #6
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5040 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 4 ms 5204 KB Output is correct
5 Correct 117 ms 22704 KB Output is correct
6 Correct 57 ms 36644 KB Output is correct
7 Correct 100 ms 31824 KB Output is correct
8 Correct 82 ms 23048 KB Output is correct
9 Correct 113 ms 29024 KB Output is correct
10 Correct 80 ms 23088 KB Output is correct
11 Correct 3 ms 5076 KB Output is correct
12 Correct 4 ms 5036 KB Output is correct
13 Correct 4 ms 5332 KB Output is correct
14 Correct 144 ms 40924 KB Output is correct
15 Correct 170 ms 40936 KB Output is correct
16 Correct 160 ms 40956 KB Output is correct
17 Correct 154 ms 40984 KB Output is correct
18 Correct 160 ms 40940 KB Output is correct
19 Correct 136 ms 41012 KB Output is correct
20 Correct 143 ms 40956 KB Output is correct
21 Correct 16 ms 6480 KB Output is correct
22 Correct 153 ms 41304 KB Output is correct
23 Correct 146 ms 41300 KB Output is correct
24 Correct 130 ms 41220 KB Output is correct
25 Correct 165 ms 41292 KB Output is correct
26 Correct 129 ms 41232 KB Output is correct
27 Correct 155 ms 41304 KB Output is correct
28 Correct 151 ms 41224 KB Output is correct
29 Correct 134 ms 41252 KB Output is correct
30 Correct 145 ms 41212 KB Output is correct
31 Correct 229 ms 26520 KB Output is correct
32 Correct 136 ms 40996 KB Output is correct
33 Correct 253 ms 35496 KB Output is correct
34 Correct 163 ms 27100 KB Output is correct
35 Correct 228 ms 34572 KB Output is correct
36 Correct 141 ms 26884 KB Output is correct
37 Correct 272 ms 34192 KB Output is correct
38 Correct 196 ms 26820 KB Output is correct
39 Correct 147 ms 41020 KB Output is correct
40 Correct 249 ms 32464 KB Output is correct
41 Correct 4 ms 5304 KB Output is correct
42 Correct 4 ms 5460 KB Output is correct
43 Correct 4 ms 5332 KB Output is correct
44 Correct 4 ms 5332 KB Output is correct
45 Correct 4 ms 5332 KB Output is correct
46 Correct 4 ms 5352 KB Output is correct
47 Correct 4 ms 5332 KB Output is correct
48 Correct 4 ms 5304 KB Output is correct
49 Correct 4 ms 5332 KB Output is correct
50 Correct 4 ms 5432 KB Output is correct
51 Correct 214 ms 27040 KB Output is correct
52 Correct 178 ms 41180 KB Output is correct
53 Correct 244 ms 32948 KB Output is correct
54 Correct 138 ms 27332 KB Output is correct
55 Correct 219 ms 26728 KB Output is correct
56 Correct 168 ms 41272 KB Output is correct
57 Correct 211 ms 34080 KB Output is correct
58 Correct 144 ms 27232 KB Output is correct
59 Correct 221 ms 27000 KB Output is correct
60 Correct 175 ms 41252 KB Output is correct
61 Correct 229 ms 34140 KB Output is correct
62 Correct 170 ms 26896 KB Output is correct
63 Correct 209 ms 26476 KB Output is correct
64 Correct 165 ms 41288 KB Output is correct
65 Correct 284 ms 34184 KB Output is correct
66 Correct 133 ms 27036 KB Output is correct
67 Correct 249 ms 26616 KB Output is correct
68 Correct 165 ms 41332 KB Output is correct
69 Correct 225 ms 31884 KB Output is correct
70 Correct 144 ms 27080 KB Output is correct