oj.uz

Submission #61511

# Submission time Handle Problem Language Result Execution time Memory
61511 2018-07-26T06:15:04 Z 김세빈(#1779) Min-max tree (BOI18_minmaxtree) C++11
100 / 100
 216 ms 15952 KB 
#include <bits/stdc++.h>

using namespace std;

struct chain
{
	int s, e, v;
	chain() {}
	chain(int s, int e, int v) : s(s), e(e), v(v) {}
};

vector <chain> X, Y;
vector <int> V[70707], T;
int P[70707], D[70707];
int K1[70707], K2[70707], C1[70707], C2[70707];
vector <int> G[70707];
int M[70707], chk[70707];
int n, k, cnt;

void dfs(int p, int r)
{
	P[p] = K1[p] = K2[p] = r;
	D[p] = D[r] + 1;
	for(int t: V[p]){
		if(t != r) dfs(t, p);
	}
}

bool find_match(int p, int c)
{
	chk[p] = c;
	for(int t: G[p]){
		if(M[t] == -1 || (chk[M[t]] != c && find_match(M[t], c))){
			M[t] = p;
			return 1;
		}
	}
	
	return 0;
}

int main()
{
	int i, a, b, c;
	char str[3];
	
	scanf("%d", &n);
	
	for(i=1; i<n; i++){
		scanf("%d%d", &a, &b);
		V[a].push_back(b);
		V[b].push_back(a);
	}
	
	for(i=1; i<=n; i++){
		C1[i] = C2[i] = M[i] = -1;
	}
	
	dfs(1, 0);
	
	scanf("%d", &k);
	
	for(i=1; i<=k; i++){
		scanf("%s%d%d%d", str, &a, &b, &c);
		if(*str == 'M'){
			X.push_back(chain(a, b, c));
		}
		else{
			Y.push_back(chain(a, b, c));
		}
	}
	
	sort(X.begin(), X.end(), [=](chain ca, chain cb){
		return ca.v < cb.v;
	});
	
	for(i=0; i<X.size(); i++){
		a = X[i].s, b = X[i].e, c = X[i].v;
		T.clear();
		
		for(; a!=b; ){
			if(D[a] < D[b]) swap(a, b);
			if(C1[a] == -1){
				C1[a] = X[i].v;
				G[i].push_back(a);
			}
			T.push_back(a); a = K1[a];
		}
		
		for(int t: T) K1[t] = a;
	}
	
	sort(Y.begin(), Y.end(), [=](chain ca, chain cb){
		return ca.v > cb.v;
	});
	
	for(i=0; i<Y.size(); i++){
		a = Y[i].s, b = Y[i].e, c = Y[i].v;
		T.clear();
		
		for(; a!=b; ){
			if(D[a] < D[b]) swap(a, b);
			if(C2[a] == -1){
				C2[a] = Y[i].v;
				G[X.size() + i].push_back(a);
			}
			T.push_back(a); a = K2[a];
		}
		
		for(int t: T) K2[t] = a;
	}
	
	for(i=0; i<k; i++){
		find_match(i, ++cnt);
	}
	
	for(i=2; i<=n; i++){
		if(C2[i] != -1 && M[i] >= X.size()) printf("%d %d %d\n", i, P[i], C2[i]);
		else if(C1[i] != -1) printf("%d %d %d\n", i, P[i], C1[i]);
		else printf("%d %d %d\n", i, P[i], 12345);
	}
	
	return 0;
}

Compilation message

minmaxtree.cpp: In function 'int main()':
minmaxtree.cpp:77:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0; i<X.size(); i++){
           ~^~~~~~~~~
minmaxtree.cpp:97:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0; i<Y.size(); i++){
           ~^~~~~~~~~
minmaxtree.cpp:118:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(C2[i] != -1 && M[i] >= X.size()) printf("%d %d %d\n", i, P[i], C2[i]);
                     ~~~~~^~~~~~~~~~~
minmaxtree.cpp:47:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
minmaxtree.cpp:50:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &a, &b);
   ~~~~~^~~~~~~~~~~~~~~~
minmaxtree.cpp:61:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &k);
  ~~~~~^~~~~~~~~~
minmaxtree.cpp:64:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s%d%d%d", str, &a, &b, &c);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 3704 KB Output is correct
2 Correct 6 ms 3776 KB Output is correct
3 Correct 5 ms 3776 KB Output is correct
4 Correct 8 ms 3776 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 206 ms 14552 KB Output is correct
2 Correct 151 ms 14552 KB Output is correct
3 Correct 132 ms 14552 KB Output is correct
4 Correct 173 ms 15264 KB Output is correct
5 Correct 171 ms 15264 KB Output is correct
6 Correct 176 ms 15264 KB Output is correct
7 Correct 183 ms 15264 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 129 ms 15264 KB Output is correct
2 Correct 149 ms 15264 KB Output is correct
3 Correct 159 ms 15264 KB Output is correct
4 Correct 157 ms 15264 KB Output is correct
5 Correct 147 ms 15264 KB Output is correct
6 Correct 129 ms 15264 KB Output is correct
7 Correct 115 ms 15264 KB Output is correct
8 Correct 146 ms 15264 KB Output is correct

Subtask #4
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 3704 KB Output is correct
2 Correct 6 ms 3776 KB Output is correct
3 Correct 5 ms 3776 KB Output is correct
4 Correct 8 ms 3776 KB Output is correct
5 Correct 206 ms 14552 KB Output is correct
6 Correct 151 ms 14552 KB Output is correct
7 Correct 132 ms 14552 KB Output is correct
8 Correct 173 ms 15264 KB Output is correct
9 Correct 171 ms 15264 KB Output is correct
10 Correct 176 ms 15264 KB Output is correct
11 Correct 183 ms 15264 KB Output is correct
12 Correct 129 ms 15264 KB Output is correct
13 Correct 149 ms 15264 KB Output is correct
14 Correct 159 ms 15264 KB Output is correct
15 Correct 157 ms 15264 KB Output is correct
16 Correct 147 ms 15264 KB Output is correct
17 Correct 129 ms 15264 KB Output is correct
18 Correct 115 ms 15264 KB Output is correct
19 Correct 146 ms 15264 KB Output is correct
20 Correct 192 ms 15264 KB Output is correct
21 Correct 169 ms 15264 KB Output is correct
22 Correct 124 ms 15264 KB Output is correct
23 Correct 144 ms 15264 KB Output is correct
24 Correct 172 ms 15264 KB Output is correct
25 Correct 197 ms 15952 KB Output is correct
26 Correct 216 ms 15952 KB Output is correct
27 Correct 152 ms 15952 KB Output is correct
28 Correct 196 ms 15952 KB Output is correct
29 Correct 196 ms 15952 KB Output is correct
30 Correct 160 ms 15952 KB Output is correct
31 Correct 183 ms 15952 KB Output is correct
32 Correct 192 ms 15952 KB Output is correct
33 Correct 160 ms 15952 KB Output is correct
34 Correct 185 ms 15952 KB Output is correct
35 Correct 129 ms 15952 KB Output is correct