oj.uz

답안 #963252

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
963252 2024-04-14T19:24:18 Z noobcodur Election Campaign (JOI15_election_campaign) C++14
100 / 100
 183 ms 48064 KB 
#include<bits/stdc++.h>
using namespace std;

using ld = long double;

#define int long long
#define pii pair<int,int>
#define forn(i,j) for(int i = 0; i < j; ++i)
#define forrange(i,j,k) for(int i = j; i < k; ++i)
#define vi vector<int>
#define vpii vector<pii>
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()

const int MOD = 1e9+7; const int INF = 1e17+1; const int maxN = 2e5+1;

void setIO(string name){
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	if(!name.empty()){
		freopen((name + ".in").c_str(),"r",stdin);
		freopen((name + ".out").c_str(),"w",stdout);
	}
}

struct Query{
	int a,b,c;
};

int bit[maxN];

void update(int idx, int val){
	while(idx < maxN){
		bit[idx] += val;
		idx += idx&-idx;
	}
}

int sum(int idx){
	int res = 0;

	while(idx > 0){
		res += bit[idx];
		idx -= idx&-idx;
	}

	return res;
}

int dp[maxN][2],tin[maxN],tout[maxN],blift[maxN][20],timer = 0;
vi graph[maxN];
vector<Query> Q[maxN];

void dfs(int src, int prev){
	tin[src] = ++timer;

	for(int ch : graph[src]){
		if(ch == prev) continue;
		blift[ch][0] = src;
		dfs(ch,src);
	}

	tout[src] = timer;
}

void dfs2(int src, int prev){
	for(int ch : graph[src]){
		if(ch == prev) continue;

		dfs2(ch,src);
		dp[src][0] += dp[ch][1];
	}

	dp[src][1] = dp[src][0];

	for(auto [a,b,cost] : Q[src]){
		dp[src][1] = max(dp[src][1],dp[src][0] + sum(tin[a]) + sum(tin[b]) + cost);
	}

	update(tin[src],dp[src][0]-dp[src][1]);
	update(tout[src]+1,dp[src][1]-dp[src][0]);
}

bool ancestor(int a, int b){
	return ((tin[a] <= tin[b]) && (tout[a] >= tout[b]));
}

int lca(int a, int b){
	for(int j = 19; j >= 0; --j){
		if(!ancestor(blift[a][j],b)){
			a = blift[a][j];
		}
	}

	if(ancestor(a,b)) return a;

	return blift[a][0];
}

signed main(){
	setIO("");
	int n; cin >> n;
	tout[0] = INF;

	forn(i,n-1){
		int a,b; cin >> a >> b;
		graph[a].pb(b); graph[b].pb(a);
	}

	dfs(1,-1);

	forrange(j,1,20){
		forrange(i,1,n+1){
			blift[i][j] = blift[blift[i][j-1]][j-1];
		}
	}

	int m; cin >> m;

	while(m--){
		int a,b,c; cin >> a >> b >> c;
		Q[lca(a,b)].pb({a,b,c});
	}

	dfs2(1,-1);

	cout << dp[1][1] << endl;
}

Compilation message

election_campaign.cpp: In function 'void dfs2(long long int, long long int)':
election_campaign.cpp:79:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   79 |  for(auto [a,b,cost] : Q[src]){
      |           ^
election_campaign.cpp: In function 'void setIO(std::string)':
election_campaign.cpp:24:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   freopen((name + ".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
election_campaign.cpp:25:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   freopen((name + ".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16988 KB Output is correct
2 Correct 3 ms 16988 KB Output is correct
3 Correct 4 ms 16996 KB Output is correct
4 Correct 4 ms 16988 KB Output is correct
5 Correct 65 ms 36688 KB Output is correct
6 Correct 47 ms 43604 KB Output is correct
7 Correct 75 ms 43168 KB Output is correct
8 Correct 56 ms 36688 KB Output is correct
9 Correct 66 ms 39684 KB Output is correct
10 Correct 56 ms 36580 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16988 KB Output is correct
2 Correct 4 ms 17244 KB Output is correct
3 Correct 4 ms 16984 KB Output is correct
4 Correct 121 ms 47936 KB Output is correct
5 Correct 102 ms 47824 KB Output is correct
6 Correct 104 ms 47928 KB Output is correct
7 Correct 108 ms 47796 KB Output is correct
8 Correct 112 ms 48056 KB Output is correct
9 Correct 105 ms 47888 KB Output is correct
10 Correct 119 ms 48064 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16988 KB Output is correct
2 Correct 4 ms 17244 KB Output is correct
3 Correct 4 ms 16984 KB Output is correct
4 Correct 121 ms 47936 KB Output is correct
5 Correct 102 ms 47824 KB Output is correct
6 Correct 104 ms 47928 KB Output is correct
7 Correct 108 ms 47796 KB Output is correct
8 Correct 112 ms 48056 KB Output is correct
9 Correct 105 ms 47888 KB Output is correct
10 Correct 119 ms 48064 KB Output is correct
11 Correct 12 ms 18268 KB Output is correct
12 Correct 122 ms 47876 KB Output is correct
13 Correct 108 ms 47864 KB Output is correct
14 Correct 112 ms 47920 KB Output is correct
15 Correct 116 ms 47924 KB Output is correct
16 Correct 102 ms 47824 KB Output is correct
17 Correct 105 ms 47852 KB Output is correct
18 Correct 110 ms 47780 KB Output is correct
19 Correct 107 ms 48004 KB Output is correct
20 Correct 115 ms 47864 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 102 ms 40456 KB Output is correct
2 Correct 104 ms 47840 KB Output is correct
3 Correct 173 ms 45240 KB Output is correct
4 Correct 121 ms 42556 KB Output is correct
5 Correct 138 ms 44432 KB Output is correct
6 Correct 82 ms 40380 KB Output is correct
7 Correct 166 ms 44344 KB Output is correct
8 Correct 144 ms 40272 KB Output is correct
9 Correct 107 ms 47996 KB Output is correct
10 Correct 148 ms 43196 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16988 KB Output is correct
2 Correct 3 ms 16988 KB Output is correct
3 Correct 4 ms 16996 KB Output is correct
4 Correct 4 ms 16988 KB Output is correct
5 Correct 65 ms 36688 KB Output is correct
6 Correct 47 ms 43604 KB Output is correct
7 Correct 75 ms 43168 KB Output is correct
8 Correct 56 ms 36688 KB Output is correct
9 Correct 66 ms 39684 KB Output is correct
10 Correct 56 ms 36580 KB Output is correct
11 Correct 4 ms 16988 KB Output is correct
12 Correct 4 ms 17244 KB Output is correct
13 Correct 5 ms 16992 KB Output is correct
14 Correct 4 ms 16984 KB Output is correct
15 Correct 6 ms 17140 KB Output is correct
16 Correct 4 ms 16988 KB Output is correct
17 Correct 5 ms 16996 KB Output is correct
18 Correct 4 ms 16988 KB Output is correct
19 Correct 5 ms 16988 KB Output is correct
20 Correct 5 ms 17168 KB Output is correct

Subtask #6
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16988 KB Output is correct
2 Correct 3 ms 16988 KB Output is correct
3 Correct 4 ms 16996 KB Output is correct
4 Correct 4 ms 16988 KB Output is correct
5 Correct 65 ms 36688 KB Output is correct
6 Correct 47 ms 43604 KB Output is correct
7 Correct 75 ms 43168 KB Output is correct
8 Correct 56 ms 36688 KB Output is correct
9 Correct 66 ms 39684 KB Output is correct
10 Correct 56 ms 36580 KB Output is correct
11 Correct 3 ms 16988 KB Output is correct
12 Correct 4 ms 17244 KB Output is correct
13 Correct 4 ms 16984 KB Output is correct
14 Correct 121 ms 47936 KB Output is correct
15 Correct 102 ms 47824 KB Output is correct
16 Correct 104 ms 47928 KB Output is correct
17 Correct 108 ms 47796 KB Output is correct
18 Correct 112 ms 48056 KB Output is correct
19 Correct 105 ms 47888 KB Output is correct
20 Correct 119 ms 48064 KB Output is correct
21 Correct 12 ms 18268 KB Output is correct
22 Correct 122 ms 47876 KB Output is correct
23 Correct 108 ms 47864 KB Output is correct
24 Correct 112 ms 47920 KB Output is correct
25 Correct 116 ms 47924 KB Output is correct
26 Correct 102 ms 47824 KB Output is correct
27 Correct 105 ms 47852 KB Output is correct
28 Correct 110 ms 47780 KB Output is correct
29 Correct 107 ms 48004 KB Output is correct
30 Correct 115 ms 47864 KB Output is correct
31 Correct 102 ms 40456 KB Output is correct
32 Correct 104 ms 47840 KB Output is correct
33 Correct 173 ms 45240 KB Output is correct
34 Correct 121 ms 42556 KB Output is correct
35 Correct 138 ms 44432 KB Output is correct
36 Correct 82 ms 40380 KB Output is correct
37 Correct 166 ms 44344 KB Output is correct
38 Correct 144 ms 40272 KB Output is correct
39 Correct 107 ms 47996 KB Output is correct
40 Correct 148 ms 43196 KB Output is correct
41 Correct 4 ms 16988 KB Output is correct
42 Correct 4 ms 17244 KB Output is correct
43 Correct 5 ms 16992 KB Output is correct
44 Correct 4 ms 16984 KB Output is correct
45 Correct 6 ms 17140 KB Output is correct
46 Correct 4 ms 16988 KB Output is correct
47 Correct 5 ms 16996 KB Output is correct
48 Correct 4 ms 16988 KB Output is correct
49 Correct 5 ms 16988 KB Output is correct
50 Correct 5 ms 17168 KB Output is correct
51 Correct 125 ms 40216 KB Output is correct
52 Correct 110 ms 47812 KB Output is correct
53 Correct 183 ms 43384 KB Output is correct
54 Correct 95 ms 40540 KB Output is correct
55 Correct 122 ms 40272 KB Output is correct
56 Correct 132 ms 48028 KB Output is correct
57 Correct 169 ms 44096 KB Output is correct
58 Correct 87 ms 40544 KB Output is correct
59 Correct 124 ms 42124 KB Output is correct
60 Correct 112 ms 47816 KB Output is correct
61 Correct 159 ms 44172 KB Output is correct
62 Correct 94 ms 40060 KB Output is correct
63 Correct 109 ms 40072 KB Output is correct
64 Correct 127 ms 47940 KB Output is correct
65 Correct 143 ms 44008 KB Output is correct
66 Correct 90 ms 40396 KB Output is correct
67 Correct 120 ms 40252 KB Output is correct
68 Correct 112 ms 47848 KB Output is correct
69 Correct 141 ms 42896 KB Output is correct
70 Correct 102 ms 40440 KB Output is correct