oj.uz

Submission #129702

# Submission time Handle Problem Language Result Execution time Memory
129702 2019-07-13T05:04:30 Z 김세빈(#3138) 물병 (JOI14_bottle) C++14
30 / 100
 830 ms 56100 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{
						if(abs(D[t] - D[p]) != 1) for(; ; );
						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);
				if(~x.c & 1) for(; ; );
				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:88:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0; i<K.size(); i++){
            ~^~~~~~~~~
bottle.cpp:94:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     V[S[i] + E[i] >> 1].push_back(i);
       ~~~~~^~~~~~
bottle.cpp:101:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0; i<K.size(); i++){
            ~^~~~~~~~~
bottle.cpp:105:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
      E[t] = (S[t] + E[t] >> 1) - 1;
              ~~~~~^~~~~~
bottle.cpp:107:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     else S[t] = (S[t] + E[t] >> 1) + 1;
                  ~~~~~^~~~~~
bottle.cpp:113:15: 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:79:8: 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 5496 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 10744 KB Output is correct
2 Correct 48 ms 8824 KB Output is correct
3 Correct 426 ms 40648 KB Output is correct
4 Correct 613 ms 40680 KB Output is correct
5 Correct 749 ms 41296 KB Output is correct
6 Correct 436 ms 40824 KB Output is correct
7 Correct 644 ms 40716 KB Output is correct
8 Correct 736 ms 41208 KB Output is correct
9 Correct 830 ms 41100 KB Output is correct
10 Correct 509 ms 40568 KB Output is correct
11 Correct 607 ms 40800 KB Output is correct
12 Correct 184 ms 34040 KB Output is correct
13 Correct 230 ms 34040 KB Output is correct
14 Correct 169 ms 33928 KB Output is correct
15 Correct 237 ms 33860 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 617 ms 56100 KB Output isn't correct
2 Halted 0 ms 0 KB -