oj.uz

답안 #248921

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
248921 2020-07-13T18:17:19 Z patrikpavic2 구슬과 끈 (APIO14_beads) C++17
57 / 100
 652 ms 113800 KB 
#include <cstdio>
#include <cstring>
#include <vector>
#include <algorithm>
#include <unordered_map>
#include <ext/pb_ds/assoc_container.hpp>
 
#define X first
#define Y second
#define PB push_back
 
using namespace std;
using namespace __gnu_pbds;
 
typedef pair < int, int > pii;
typedef int ll;
 
const int N = 2e5 + 500;
const ll INF = 2e9;
 
vector < pii > v[N];
gp_hash_table < ll, ll > dp[3];
gp_hash_table < ll, ll > vr;
ll zbr[N];
vector < pair < ll, int > > kand[N];
int n, jesam[N];
 
 
 
ll f(int x, int fl, int lst){
	if(dp[fl][x * (N - 37) + lst] != 0) 
		return dp[fl][x * (N - 37) + lst] - 1;
	//printf("x = %d fl = %d lst = %d\n", x, fl, lst);
	//char c; scanf("%c", &c);
	if(!jesam[x]){
		ll sm = 0;
		for(pii nxt : v[x]){
			if(nxt.X == lst) continue;
			ll opt = max(f(nxt.X, 0, x), f(nxt.X, 1, x) + (ll)nxt.Y);
			sm += opt;
			kand[x].PB({f(nxt.X, 2, x) + nxt.Y - opt, nxt.X});
		}
		kand[x].PB({-INF, -1}); 
		kand[x].PB({-INF, -1}); 
		sort(kand[x].rbegin(), kand[x].rend());
		jesam[x] = (x == lst ? n + 1 : lst); zbr[x] = sm;
		return (dp[fl][x * (N - 37) + lst] = sm + kand[x][0].X * (fl == 1) + 1) - 1;
	}
	if(jesam[x] == lst){
		return (dp[fl][x * (N - 37) + lst] = zbr[x] + kand[x][0].X * (fl == 1) + 1) - 1;		
	}
	if(jesam[x] < n + 1){
		ll opt = max(f(jesam[x], 0, x), f(jesam[x], 1, x) + vr[x * (N - 37) + jesam[x]]);
		zbr[x] += opt;
		kand[x].PB({f(jesam[x], 2, x) + vr[x * (N - 37) + jesam[x]] - opt, jesam[x]});
		sort(kand[x].rbegin(), kand[x].rend());
		jesam[x] = n + 1;
	}
	ll sm = zbr[x] - (x == lst ? 0 : max(f(lst, 0, x), f(lst, 1, x) + vr[x * (N - 37) + lst]));
	ll dod = kand[x][0].X;
	if(kand[x][0].Y == lst)
		dod = kand[x][1].X;
	//printf("x = %d fl = %d lst = %d --> %lld + %lld\n", x, fl, lst, sm , dod * (fl == 1));
	return (dp[fl][x * (N - 37) + lst] = sm + dod * (fl == 1) + 1) - 1;		
}
 
 
int main(){
	scanf("%d", &n);
	for(int i = 1;i < n;i++){
		int x, y, z; scanf("%d%d%d", &x, &y, &z);
		v[x].PB({y, z}), v[y].PB({x, z});
		vr[x * (N - 37) + y] = z, vr[y * (N - 37) + x] = z;
	}
	ll sol = 0;
	for(int i = 1;i <= n;i++)
		sol = max(sol, f(i, 0, i));
	printf("%d\n", sol);
	return 0;
}

Compilation message

beads.cpp: In function 'int main()':
beads.cpp:69:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
beads.cpp:71:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int x, y, z; scanf("%d%d%d", &x, &y, &z);
                ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 9728 KB Output is correct
2 Correct 6 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 6 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9728 KB Output is correct
11 Correct 6 ms 9728 KB Output is correct
12 Correct 6 ms 9728 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 9728 KB Output is correct
2 Correct 6 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 6 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9728 KB Output is correct
11 Correct 6 ms 9728 KB Output is correct
12 Correct 6 ms 9728 KB Output is correct
13 Correct 6 ms 9728 KB Output is correct
14 Correct 6 ms 9728 KB Output is correct
15 Correct 6 ms 9728 KB Output is correct
16 Correct 6 ms 9856 KB Output is correct
17 Correct 6 ms 9856 KB Output is correct
18 Correct 6 ms 9856 KB Output is correct
19 Correct 6 ms 9856 KB Output is correct
20 Correct 6 ms 9856 KB Output is correct
21 Correct 6 ms 9856 KB Output is correct
22 Correct 6 ms 9856 KB Output is correct

Subtask #3
29.0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 9728 KB Output is correct
2 Correct 6 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 6 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9728 KB Output is correct
11 Correct 6 ms 9728 KB Output is correct
12 Correct 6 ms 9728 KB Output is correct
13 Correct 6 ms 9728 KB Output is correct
14 Correct 6 ms 9728 KB Output is correct
15 Correct 6 ms 9728 KB Output is correct
16 Correct 6 ms 9856 KB Output is correct
17 Correct 6 ms 9856 KB Output is correct
18 Correct 6 ms 9856 KB Output is correct
19 Correct 6 ms 9856 KB Output is correct
20 Correct 6 ms 9856 KB Output is correct
21 Correct 6 ms 9856 KB Output is correct
22 Correct 6 ms 9856 KB Output is correct
23 Correct 14 ms 12176 KB Output is correct
24 Correct 15 ms 12052 KB Output is correct
25 Correct 15 ms 12220 KB Output is correct
26 Correct 27 ms 14648 KB Output is correct
27 Correct 24 ms 14648 KB Output is correct
28 Correct 154 ms 14632 KB Output is correct
29 Correct 35 ms 15000 KB Output is correct
30 Correct 46 ms 15032 KB Output is correct
31 Correct 26 ms 14940 KB Output is correct

Subtask #4
0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 9728 KB Output is correct
2 Correct 6 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 6 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9728 KB Output is correct
11 Correct 6 ms 9728 KB Output is correct
12 Correct 6 ms 9728 KB Output is correct
13 Correct 6 ms 9728 KB Output is correct
14 Correct 6 ms 9728 KB Output is correct
15 Correct 6 ms 9728 KB Output is correct
16 Correct 6 ms 9856 KB Output is correct
17 Correct 6 ms 9856 KB Output is correct
18 Correct 6 ms 9856 KB Output is correct
19 Correct 6 ms 9856 KB Output is correct
20 Correct 6 ms 9856 KB Output is correct
21 Correct 6 ms 9856 KB Output is correct
22 Correct 6 ms 9856 KB Output is correct
23 Correct 14 ms 12176 KB Output is correct
24 Correct 15 ms 12052 KB Output is correct
25 Correct 15 ms 12220 KB Output is correct
26 Correct 27 ms 14648 KB Output is correct
27 Correct 24 ms 14648 KB Output is correct
28 Correct 154 ms 14632 KB Output is correct
29 Correct 35 ms 15000 KB Output is correct
30 Correct 46 ms 15032 KB Output is correct
31 Correct 26 ms 14940 KB Output is correct
32 Correct 180 ms 35748 KB Output is correct
33 Correct 127 ms 35744 KB Output is correct
34 Correct 127 ms 35748 KB Output is correct
35 Incorrect 652 ms 113800 KB Output isn't correct
36 Halted 0 ms 0 KB -