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Submission #36894

# Submission time Handle Problem Language Result Execution time Memory
36894 2017-12-17T15:02:57 Z mohammad_kilani Beads and wires (APIO14_beads) C++14
28 / 100
 7 ms 384 KB 
#include <bits/stdc++.h>
using namespace std;
#define mod 1000000007
#define oo 2000000000
const int N = 210;
vector< pair<int,int> > g[N];
int n , dp[N][2];

int calc(int node,bool b,int prnt,int w){
	if(dp[node][b] != -1) return dp[node][b];
	dp[node][b] = 0 ;
	if(b == 1){
		for(int i=0;i<g[node].size();i++){
			if(g[node][i].first == prnt) continue;
			dp[node][b] += max(calc(g[node][i].first,0,node,g[node][i].second),calc(g[node][i].first,1,node,g[node][i].second));
		}
	}
	else{
		int sum = 0 ;
		vector< pair<int,int> > v;
		for(int i=0;i<g[node].size();i++){
			if(g[node][i].first == prnt){
				v.push_back(make_pair(-1,-1));
				continue;
			}
			int cur = calc(g[node][i].first,0,node,g[node][i].second);
			int cur2 = calc(g[node][i].first,1,node,g[node][i].second);
			v.push_back(make_pair(cur,cur2));
			sum += max(cur,cur2);
		}
		for(int i=0;i<v.size();i++){
			if(v[i].first == -1) continue;
			sum -= max(v[i].first,v[i].second);
			sum += w + g[node][i].second + v[i].second;
			dp[node][b] = max(dp[node][b],sum);
			sum -= (w + g[node][i].second + v[i].second);
			sum += max(v[i].first,v[i].second);
		}
	}
	return dp[node][b];
}

int main() {
	//freopen("in.txt","r",stdin);
	scanf("%d",&n);
	for(int i=0;i<n-1;i++){
		int u ,v , w;
		scanf("%d%d%d",&u,&v,&w);
		g[u].push_back(make_pair(v,w));
		g[v].push_back(make_pair(u,w));
	}
	int ans = 0 ;
	for(int i=1;i<=n;i++){
		memset(dp,-1,sizeof(dp));
		ans = max(ans,calc(i,1,-1,0));
	}
	cout << ans << endl;
	return 0;
}

Compilation message

beads.cpp: In function 'int calc(int, bool, int, int)':
beads.cpp:13:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<g[node].size();i++){
               ~^~~~~~~~~~~~~~~
beads.cpp:21:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<g[node].size();i++){
               ~^~~~~~~~~~~~~~~
beads.cpp:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~
beads.cpp: In function 'int main()':
beads.cpp:45:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
beads.cpp:48:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d",&u,&v,&w);
   ~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 256 KB Output is correct
6 Correct 2 ms 256 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 256 KB Output is correct
6 Correct 2 ms 256 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 3 ms 256 KB Output is correct
14 Correct 3 ms 256 KB Output is correct
15 Correct 3 ms 256 KB Output is correct
16 Correct 6 ms 256 KB Output is correct
17 Correct 7 ms 384 KB Output is correct
18 Correct 6 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 256 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct

Subtask #3
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 256 KB Output is correct
6 Correct 2 ms 256 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 3 ms 256 KB Output is correct
14 Correct 3 ms 256 KB Output is correct
15 Correct 3 ms 256 KB Output is correct
16 Correct 6 ms 256 KB Output is correct
17 Correct 7 ms 384 KB Output is correct
18 Correct 6 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 256 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Runtime error 2 ms 384 KB Execution killed with signal 11 (could be triggered by violating memory limits)
24 Halted 0 ms 0 KB -

Subtask #4
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 256 KB Output is correct
6 Correct 2 ms 256 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 3 ms 256 KB Output is correct
14 Correct 3 ms 256 KB Output is correct
15 Correct 3 ms 256 KB Output is correct
16 Correct 6 ms 256 KB Output is correct
17 Correct 7 ms 384 KB Output is correct
18 Correct 6 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 256 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Runtime error 2 ms 384 KB Execution killed with signal 11 (could be triggered by violating memory limits)
24 Halted 0 ms 0 KB -