oj.uz

답안 #13476

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
13476 2015-02-21T18:17:17 Z ainta 구슬과 끈 (APIO14_beads) C++
13 / 100
 11 ms 9756 KB 
#include<stdio.h>
#include<algorithm>
#include<vector>
using namespace std;
vector<int>E[200100], L[200100];
int pL[201000], n, D[201000][4];
void DFS(int a, int pp){
	int i, x, t1, t2, t3, t4, S = 0, S2 = 0, M1, M2, t, tt, M3, M4, x1, x2, x3, x4;
	for (i = 0; i < E[a].size(); i++){
		if (E[a][i] != pp){
			pL[E[a][i]] = L[a][i];
			DFS(E[a][i], a);
		}
	}
	D[a][1] = D[a][2] = D[a][3] = -999999999;
	if (!E[a].size())return;
	M1 = M2 = M3 = M4 = -999999999;
	x1 = x2 = x3 = x4 = -1;
	for (i = 0; i < E[a].size(); i++){
		x = E[a][i];
		if (x == pp)continue;
		t1 = D[x][0];
		t2 = D[x][1] + pL[x];
		t3 = D[x][2] + pL[x];
		t4 = D[x][3];
		tt = max(max(t1, t2), t4);
		t = max(t3, tt);
		S += t;
		S2 += tt;
		t1 = D[x][0] + pL[x] - tt;
		t2 = D[x][3] + pL[x] - tt;
		if (M1 < t1){ M2 = M1, x2 = x1; M1 = t1, x1 = i; }
		else if (M2 < t1) M2 = t1, x2 = i;
		if (M3 < t2){ M4 = M3, x4 = x3; M3 = t2, x3 = i; }
		else if (M4 < t2) M4 = t2, x4 = i;
	}
	D[a][0] = S;
	D[a][1] = S2 + M1;
	D[a][2] = S2 + M3;
	if (E[a].size() >= 2){
		t1 = M1 + M2;
		if (x1 == x3) t2 = max(M1 + M4, M2 + M3);
		else t2 = M1 + M3;
		D[a][3] = S2 + max(t1, t2);
	}
}
int main(){
	int i, a, b, d;
	scanf("%d", &n);
	for (i = 1; i < n; i++){
		scanf("%d%d%d", &a, &b, &d);
		E[a].push_back(b); E[b].push_back(a);
		L[a].push_back(d); L[b].push_back(d);
	}
	DFS(1, 0);
	printf("%d\n", max(D[1][0], D[1][3]));
}

Compilation message

beads.cpp: In function 'void DFS(int, int)':
beads.cpp:9:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < E[a].size(); i++){
              ~~^~~~~~~~~~~~~
beads.cpp:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < E[a].size(); i++){
              ~~^~~~~~~~~~~~~
beads.cpp: In function 'int main()':
beads.cpp:49:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
beads.cpp:51:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d", &a, &b, &d);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 9 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 9 ms 9728 KB Output is correct
7 Correct 10 ms 9728 KB Output is correct
8 Correct 9 ms 9728 KB Output is correct
9 Correct 11 ms 9728 KB Output is correct
10 Correct 11 ms 9728 KB Output is correct
11 Correct 10 ms 9728 KB Output is correct
12 Correct 10 ms 9756 KB Output is correct

Subtask #2
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 9 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 9 ms 9728 KB Output is correct
7 Correct 10 ms 9728 KB Output is correct
8 Correct 9 ms 9728 KB Output is correct
9 Correct 11 ms 9728 KB Output is correct
10 Correct 11 ms 9728 KB Output is correct
11 Correct 10 ms 9728 KB Output is correct
12 Correct 10 ms 9756 KB Output is correct
13 Incorrect 9 ms 9728 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #3
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 9 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 9 ms 9728 KB Output is correct
7 Correct 10 ms 9728 KB Output is correct
8 Correct 9 ms 9728 KB Output is correct
9 Correct 11 ms 9728 KB Output is correct
10 Correct 11 ms 9728 KB Output is correct
11 Correct 10 ms 9728 KB Output is correct
12 Correct 10 ms 9756 KB Output is correct
13 Incorrect 9 ms 9728 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #4
0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 9 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 9 ms 9728 KB Output is correct
7 Correct 10 ms 9728 KB Output is correct
8 Correct 9 ms 9728 KB Output is correct
9 Correct 11 ms 9728 KB Output is correct
10 Correct 11 ms 9728 KB Output is correct
11 Correct 10 ms 9728 KB Output is correct
12 Correct 10 ms 9756 KB Output is correct
13 Incorrect 9 ms 9728 KB Output isn't correct
14 Halted 0 ms 0 KB -