oj.uz

Submission #129701

# Submission time Handle Problem Language Result Execution time Memory
129701 2019-07-13T05:03:28 Z 김세빈(#3138) 물병 (JOI14_bottle) C++14
30 / 100
 912 ms 56244 KB 
#include <bits/stdc++.h>

using namespace std;

struct edge{
	int u, v, c;
	edge() {}
	edge(int u, int v, int c) : u(u), v(v), c(c) {}
};

char B[2020][2020];
queue <int> Q;
vector <edge> K, T;
vector <int> V[202020];
int C[4040404], D[4040404], P[202020];
int X[202020], Y[202020], S[202020], E[202020];
int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
int n, m, k, q;

int find(int p) { return p == P[p]? p : P[p] = find(P[p]); }
void unite(int p, int q) { P[find(p)] = find(q); }

int main()
{
	int i, x, y, p, t, f;
	
	scanf("%d%d%d%d", &n, &m, &k, &q);
	
	for(i=0; i<n; i++){
		scanf("%s", B[i]);
	}
	
	for(i=1; i<=k; i++){
		scanf("%d%d", &x, &y);
		x --; y --; t = x * m + y;
		Q.push(t); C[t] = i; D[t] = 0;
		P[i] = i;
	}
	
	for(; !Q.empty(); ){
		p = Q.front(); Q.pop();
		x = p / m; y = p % m;
		
		for(i=0; i<4; i++){
			x += dx[i]; y += dy[i];
			if(0 <= x && x < n && 0 <= y && y < m && B[x][y] == '.'){
				t = x * m + y;
				if(!C[t]) Q.push(t), C[t] = C[p], D[t] = D[p] + 1;
				else if(find(C[t]) != find(C[p])){
					if(D[t] == D[p]){
						unite(C[t], C[p]);
						K.emplace_back(C[p], C[t], D[t] + D[p]);
					}
					else T.emplace_back(C[p], C[t], D[t] + D[p]);
				}
			}
			x -= dx[i]; y -= dy[i];
		}
		
		for(edge &x: T){
			if(find(x.u) != find(x.v)){
				unite(x.u, x.v);
				K.push_back(x);
			}
		}
		
		T.clear();
	}
	
	sort(K.begin(), K.end(), [&](edge &ea, edge &eb){
		return ea.c < eb.c;
	});
	
	for(i=1; i<=q; i++){
		scanf("%d%d", X + i, Y + i);
		S[i] = 0; E[i] = K.size() - 1;
	}
	
	for(; ; ){
		for(i=1; i<=k; i++){
			P[i] = i;
		}
		
		for(i=0; i<K.size(); i++){
			V[i].clear();
		}
		
		for(i=1, f=0; i<=q; i++){
			if(S[i] <= E[i]){
				V[S[i] + E[i] >> 1].push_back(i);
				f = 1;
			}
		}
		
		if(!f) break;
		
		for(i=0; i<K.size(); i++){
			unite(K[i].u, K[i].v);
			for(int &t: V[i]){
				if(find(X[t]) == find(Y[t])){
					E[t] = (S[t] + E[t] >> 1) - 1;
				}
				else S[t] = (S[t] + E[t] >> 1) + 1;
			}
		}
	}
	
	for(i=1; i<=q; i++){
		if(E[i] + 1 < K.size()) printf("%d\n", K[E[i] + 1].c);
		else printf("-1\n");
	}
		
	return 0;
}

Compilation message

bottle.cpp: In function 'int main()':
bottle.cpp:84:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0; i<K.size(); i++){
            ~^~~~~~~~~
bottle.cpp:90:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     V[S[i] + E[i] >> 1].push_back(i);
       ~~~~~^~~~~~
bottle.cpp:97:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0; i<K.size(); i++){
            ~^~~~~~~~~
bottle.cpp:101:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
      E[t] = (S[t] + E[t] >> 1) - 1;
              ~~~~~^~~~~~
bottle.cpp:103:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     else S[t] = (S[t] + E[t] >> 1) + 1;
                  ~~~~~^~~~~~
bottle.cpp:109:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(E[i] + 1 < K.size()) printf("%d\n", K[E[i] + 1].c);
      ~~~~~~~~~^~~~~~~~~~
bottle.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d", &n, &m, &k, &q);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
bottle.cpp:30:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", B[i]);
   ~~~~~^~~~~~~~~~~~
bottle.cpp:34:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &x, &y);
   ~~~~~^~~~~~~~~~~~~~~~
bottle.cpp:75:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", X + i, Y + i);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 9 ms 5368 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 10748 KB Output is correct
2 Correct 46 ms 8824 KB Output is correct
3 Correct 417 ms 40724 KB Output is correct
4 Correct 692 ms 40704 KB Output is correct
5 Correct 912 ms 41204 KB Output is correct
6 Correct 445 ms 40700 KB Output is correct
7 Correct 653 ms 40824 KB Output is correct
8 Correct 742 ms 41336 KB Output is correct
9 Correct 854 ms 41208 KB Output is correct
10 Correct 500 ms 40568 KB Output is correct
11 Correct 574 ms 40956 KB Output is correct
12 Correct 177 ms 34008 KB Output is correct
13 Correct 229 ms 33792 KB Output is correct
14 Correct 188 ms 34036 KB Output is correct
15 Correct 227 ms 33932 KB Output is correct

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 27 ms 10744 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 652 ms 56244 KB Output isn't correct
2 Halted 0 ms 0 KB -