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Submission #254907

# Submission time Handle Problem Language Result Execution time Memory
254907 2020-07-30T20:14:25 Z Lawliet Bridges (APIO19_bridges) C++17
59 / 100
 3000 ms 10340 KB 
#include <bits/stdc++.h>
 
using namespace std;
typedef pair<int,int> pii;
 
const int MAXN = 100010;
 
int n, m, q;
int raizQ;
 
int ans[MAXN];
int indInside[MAXN];
int lastWeight[MAXN];
int anc[MAXN], sz[MAXN];
int U[MAXN], V[MAXN], W[MAXN];
 
bool mark[MAXN];
bool insideBlock[MAXN];
 
vector<int> adj[MAXN];
 
vector<pii> queries;
vector< pair<int,pii> > sweep;
 
int find(int cur)
{
	if( anc[cur] == cur ) return cur;
	return anc[cur] = find( anc[cur] );
}
 
void join(int i, int j)
{
	i = find(i); j = find(j);
 
	if( i == j ) return;
 
	if( sz[i] < sz[j] )
		swap( i , j );
 
	anc[j] = i;
	sz[i] += sz[j];
}
 
bool isUpdate(int i)
{
	int val = queries[i].second;
	return ( val > 0 );
}
 
void initDSU()
{
	for(int i = 1 ; i <= n ; i++)
		sz[i] = 1, anc[i] = i;
}
 
int DFS(int cur)
{
	mark[cur] = true;
	int ans = sz[cur];
 
	for(int i = 0 ; i < (int)adj[cur].size() ; i++)
		if( !mark[ adj[cur][i] ] ) ans += DFS( adj[cur][i] );
 
	return ans;
}
 
int main()
{
	scanf("%d %d",&n,&m);
 
	for(int i = 1 ; i <= m ; i++)
		scanf("%d %d %d",&U[i],&V[i],&W[i]);
 
	scanf("%d",&q);
	raizQ = sqrt(q) + 1;
 
	for(int i = 1 ; i <= q ; i++)
	{
		int type;
		scanf("%d",&type);
 
		if( type == 1 )
		{
			int edge, newW;
			scanf("%d %d",&edge,&newW);
 
			queries.push_back( { newW , edge } );
		}
		if( type == 2 )
		{
			int s, maxW;
			scanf("%d %d",&s,&maxW);
 
			queries.push_back( { maxW , -s } );
		}
 
		ans[i - 1] = -1;
	}
 
	int lastBlock = (q - 1)/raizQ;
 
	for(int block = 0 ; block <= lastBlock ; block++)
	{
		//printf("+============================+ Processando bloco %d\n",block);
 
		int L = block*raizQ;
		int R = (block + 1)*raizQ - 1;
		R = min( R , q - 1 );
 
		for(int i = 1 ; i <= m ; i++)
		{
			lastWeight[i] = W[i];
			insideBlock[i] = false;
		}
 
		vector<int> inside;
 
		for(int i = L ; i <= R ; i++)
		{
			if( isUpdate( i ) ) 
			{
				int edge = queries[i].second;
 
				if( !insideBlock[edge] )
				{
					indInside[edge] = (int)inside.size();
 
					//printf(".. edge = %d\n",edge);
					insideBlock[edge] = true;
					inside.push_back( edge );
				}
			}
		}
 
		for(int i = 0 ; i < L ; i++)
		{
			if( isUpdate( i ) )
			{
				int newW = queries[i].first;
				int edge = queries[i].second;
 
				lastWeight[edge] = newW;
			}
		}
 
		sweep.clear();
 
		for(int i = 1 ; i <= m ; i++)
			if( !insideBlock[i] ) sweep.push_back( { lastWeight[i] , { U[i] , V[i] } } );//, printf("Adicionei %d: %d -> %d com peso %d\n",i,U[i],V[i],lastWeight[i]);
 
		for(int i = L ; i <= R ; i++)
		{
			if( !isUpdate( i ) )
			{
				int maxW = queries[i].first;
				int source = -queries[i].second;
 
				//printf("Achei query %d %d\n",source,maxW);
 
				sweep.push_back( { maxW , { -source , i } } );
			}
		}
 
		//printf("\n\n\n");
		//printf("------- Sweep Algorithm\n");
 
		sort( sweep.begin() , sweep.end() );
 
		initDSU();
 
		for(int i = (int)sweep.size() - 1 ; i >= 0 ; i--)
		{
			int type = 0;
			if( sweep[i].second.first < 0 ) type = 1;
 
			if( type == 0 )//Update
			{
				int curU = sweep[i].second.first;
				int curV = sweep[i].second.second;
 
				//printf("Juntei %d %d\n",curU,curV);
 
				join( curU , curV );
			}
			if( type == 1 )
			{
				int maxW = sweep[i].first;
				int ind = sweep[i].second.second;
				int source = -sweep[i].second.first;
 
				//printf("Respondendo query maxW = %d source = %d ind = %d\n",maxW,source,ind);
 
				vector<int> weightInside;
 
				for(int j = 0 ; j < (int)inside.size() ; j++)
					weightInside.push_back( lastWeight[ inside[j] ] );
 
				for(int j = L ; j <= ind ; j++)
				{
					if( isUpdate( j ) )
					{
						int newW = queries[j].first;
						int edge = queries[j].second;
				
						weightInside[ indInside[edge] ] = newW;
					}
				}
 
				for(int j = 0 ; j < (int)inside.size() ; j++)
				{
					//printf("...... Tentando colocar %d -> %d com peso %d\n",U[ inside[j] ],V[ inside[j] ],weightInside[j]);
					if( weightInside[j] >= maxW ) 
					{
						int curU = find( U[ inside[j] ] );
						int curV = find( V[ inside[j] ] );
 
						adj[curU].push_back( curV );
						adj[curV].push_back( curU );
					}
				}
 
				ans[ind] = DFS( find(source) );
				mark[ find(source) ] = false;
 
				for(int j = 0 ; j < (int)inside.size() ; j++)
				{
					if( weightInside[j] >= maxW ) 
					{
						int curU = find( U[ inside[j] ] );
						int curV = find( V[ inside[j] ] );
 
						mark[curU] = mark[curV] = false;
 
						adj[curU].clear();
						adj[curV].clear();
					}
				}
			}	
		}
	}
 
	for(int i = 0 ; i < q ; i++)
		if( ans[i] != -1 ) printf("%d\n",ans[i]);
}

Compilation message

bridges.cpp: In function 'int main()':
bridges.cpp:69:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~
bridges.cpp:72:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d",&U[i],&V[i],&W[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bridges.cpp:74:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&q);
  ~~~~~^~~~~~~~~
bridges.cpp:80:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&type);
   ~~~~~^~~~~~~~~~~~
bridges.cpp:85:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d",&edge,&newW);
    ~~~~~^~~~~~~~~~~~~~~~~~~~~
bridges.cpp:92:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d",&s,&maxW);
    ~~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 27 ms 2944 KB Output is correct
4 Correct 8 ms 2944 KB Output is correct
5 Correct 18 ms 2944 KB Output is correct
6 Correct 17 ms 2944 KB Output is correct
7 Correct 19 ms 2944 KB Output is correct
8 Correct 19 ms 2944 KB Output is correct
9 Correct 21 ms 2944 KB Output is correct
10 Correct 19 ms 2944 KB Output is correct
11 Correct 25 ms 2944 KB Output is correct
12 Correct 20 ms 2944 KB Output is correct
13 Correct 21 ms 2944 KB Output is correct
14 Correct 20 ms 2944 KB Output is correct
15 Correct 20 ms 2944 KB Output is correct
16 Correct 19 ms 2944 KB Output is correct
17 Correct 20 ms 2944 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2463 ms 7500 KB Output is correct
2 Correct 2436 ms 7404 KB Output is correct
3 Correct 2447 ms 7508 KB Output is correct
4 Correct 2430 ms 7404 KB Output is correct
5 Correct 2415 ms 7404 KB Output is correct
6 Correct 2764 ms 7020 KB Output is correct
7 Correct 2742 ms 8004 KB Output is correct
8 Correct 2709 ms 7892 KB Output is correct
9 Correct 81 ms 5100 KB Output is correct
10 Correct 2355 ms 8488 KB Output is correct
11 Correct 2461 ms 8464 KB Output is correct
12 Correct 2156 ms 8044 KB Output is correct
13 Correct 2203 ms 7508 KB Output is correct

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1825 ms 6568 KB Output is correct
2 Correct 972 ms 4716 KB Output is correct
3 Correct 1958 ms 6380 KB Output is correct
4 Correct 1799 ms 6380 KB Output is correct
5 Correct 89 ms 4200 KB Output is correct
6 Correct 1864 ms 6504 KB Output is correct
7 Correct 1751 ms 6308 KB Output is correct
8 Correct 1644 ms 6436 KB Output is correct
9 Correct 1447 ms 6304 KB Output is correct
10 Correct 1401 ms 6248 KB Output is correct
11 Correct 1486 ms 6288 KB Output is correct
12 Correct 1463 ms 6376 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3078 ms 7916 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2463 ms 7500 KB Output is correct
2 Correct 2436 ms 7404 KB Output is correct
3 Correct 2447 ms 7508 KB Output is correct
4 Correct 2430 ms 7404 KB Output is correct
5 Correct 2415 ms 7404 KB Output is correct
6 Correct 2764 ms 7020 KB Output is correct
7 Correct 2742 ms 8004 KB Output is correct
8 Correct 2709 ms 7892 KB Output is correct
9 Correct 81 ms 5100 KB Output is correct
10 Correct 2355 ms 8488 KB Output is correct
11 Correct 2461 ms 8464 KB Output is correct
12 Correct 2156 ms 8044 KB Output is correct
13 Correct 2203 ms 7508 KB Output is correct
14 Correct 1825 ms 6568 KB Output is correct
15 Correct 972 ms 4716 KB Output is correct
16 Correct 1958 ms 6380 KB Output is correct
17 Correct 1799 ms 6380 KB Output is correct
18 Correct 89 ms 4200 KB Output is correct
19 Correct 1864 ms 6504 KB Output is correct
20 Correct 1751 ms 6308 KB Output is correct
21 Correct 1644 ms 6436 KB Output is correct
22 Correct 1447 ms 6304 KB Output is correct
23 Correct 1401 ms 6248 KB Output is correct
24 Correct 1486 ms 6288 KB Output is correct
25 Correct 1463 ms 6376 KB Output is correct
26 Correct 2440 ms 8368 KB Output is correct
27 Correct 2749 ms 8428 KB Output is correct
28 Correct 2558 ms 8456 KB Output is correct
29 Correct 2316 ms 8476 KB Output is correct
30 Correct 2714 ms 8604 KB Output is correct
31 Correct 2770 ms 8596 KB Output is correct
32 Correct 2794 ms 8580 KB Output is correct
33 Correct 2554 ms 10248 KB Output is correct
34 Correct 2558 ms 10340 KB Output is correct
35 Correct 2561 ms 10092 KB Output is correct
36 Correct 2392 ms 10040 KB Output is correct
37 Correct 2368 ms 10028 KB Output is correct
38 Correct 2400 ms 10264 KB Output is correct
39 Correct 2169 ms 9632 KB Output is correct
40 Correct 2125 ms 9624 KB Output is correct
41 Correct 2125 ms 9628 KB Output is correct
42 Correct 2139 ms 10132 KB Output is correct
43 Correct 2187 ms 10068 KB Output is correct
44 Correct 2182 ms 10216 KB Output is correct

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 27 ms 2944 KB Output is correct
4 Correct 8 ms 2944 KB Output is correct
5 Correct 18 ms 2944 KB Output is correct
6 Correct 17 ms 2944 KB Output is correct
7 Correct 19 ms 2944 KB Output is correct
8 Correct 19 ms 2944 KB Output is correct
9 Correct 21 ms 2944 KB Output is correct
10 Correct 19 ms 2944 KB Output is correct
11 Correct 25 ms 2944 KB Output is correct
12 Correct 20 ms 2944 KB Output is correct
13 Correct 21 ms 2944 KB Output is correct
14 Correct 20 ms 2944 KB Output is correct
15 Correct 20 ms 2944 KB Output is correct
16 Correct 19 ms 2944 KB Output is correct
17 Correct 20 ms 2944 KB Output is correct
18 Correct 2463 ms 7500 KB Output is correct
19 Correct 2436 ms 7404 KB Output is correct
20 Correct 2447 ms 7508 KB Output is correct
21 Correct 2430 ms 7404 KB Output is correct
22 Correct 2415 ms 7404 KB Output is correct
23 Correct 2764 ms 7020 KB Output is correct
24 Correct 2742 ms 8004 KB Output is correct
25 Correct 2709 ms 7892 KB Output is correct
26 Correct 81 ms 5100 KB Output is correct
27 Correct 2355 ms 8488 KB Output is correct
28 Correct 2461 ms 8464 KB Output is correct
29 Correct 2156 ms 8044 KB Output is correct
30 Correct 2203 ms 7508 KB Output is correct
31 Correct 1825 ms 6568 KB Output is correct
32 Correct 972 ms 4716 KB Output is correct
33 Correct 1958 ms 6380 KB Output is correct
34 Correct 1799 ms 6380 KB Output is correct
35 Correct 89 ms 4200 KB Output is correct
36 Correct 1864 ms 6504 KB Output is correct
37 Correct 1751 ms 6308 KB Output is correct
38 Correct 1644 ms 6436 KB Output is correct
39 Correct 1447 ms 6304 KB Output is correct
40 Correct 1401 ms 6248 KB Output is correct
41 Correct 1486 ms 6288 KB Output is correct
42 Correct 1463 ms 6376 KB Output is correct
43 Execution timed out 3078 ms 7916 KB Time limit exceeded
44 Halted 0 ms 0 KB -