Submission #5772

#TimeUsernameProblemLanguageResultExecution timeMemory
5772ainta물병 (JOI14_bottle)C++98
10 / 100
96 ms170608 KiB
#pragma warning(disable:4996) #include<stdio.h> #include<algorithm> #include<queue> #include<vector> #define X first #define Y second #define W_ 2010 #define N_ 200010 #define INF 999999999 #define PII pair<int, int> using namespace std; int H, W, n, Query, D[W_][W_], P[W_][W_], cnt, par[N_]; int pp[18][N_], LL[18][N_], Dep[N_]; vector<int>E[N_], L[N_]; priority_queue<PII>PQ; struct Edge{ int a, b, d; bool operator <(const Edge &p)const{ return d<p.d; } }Ed[W_*W_*2]; char p[W_][W_]; void Do(int x, int y, int d, int pv){ if (p[x][y] == '.' && D[x][y] > d){ P[x][y] = pv, D[x][y] = d; PQ.push(PII(-d, x*(W + 1) + y)); } } void BFS(int x, int y, int d) { if (d != D[x][y])return; d++; Do(x - 1, y, d, P[x][y]); Do(x + 1, y, d, P[x][y]); Do(x, y - 1, d, P[x][y]); Do(x, y + 1, d, P[x][y]); } int find(int a){ if (a == par[a])return a; return par[a] = find(par[a]); } void Connect(int a, int b, int d) { int x = find(a), y = find(b); if (x == y)return; E[a].push_back(b); L[a].push_back(d); E[b].push_back(a); L[b].push_back(d); par[x] = y; } void DFS(int a, int pa){ Dep[a] = Dep[pa] + 1; pp[0][a] = pa; int i; for (i = 0; i < E[a].size(); i++){ if (E[a][i] != pa){ DFS(E[a][i], a); LL[0][E[a][i]] = L[a][i]; } } } int Gap(int x, int y) { if (Dep[x] < Dep[y])return Gap(y, x); int d = Dep[x] - Dep[y], c = 0, r = 0, i; while (d){ if (d & 1){ r = max(r, LL[c][x]); x = pp[c][x]; } c++; d >>= 1; } for (i = 17; i >= 0; i--){ if (pp[i][x] != pp[i][y]){ r = max(r, max(LL[i][x], LL[i][y])); x = pp[i][x], y = pp[i][y]; } } if (x != y){ r = max(r, max(LL[0][x], LL[0][y])); x = pp[0][x], y = pp[0][y]; } if (!x)return -1; return r; } int main() { int i, j, x, y; PII t; scanf("%d%d%d%d", &H, &W, &n, &Query); for (i = 1; i <= H; i++){ scanf("%s", p[i] + 1); for (j = 1; j <= W; j++){ D[i][j] = INF; } } for (i = 1; i <= n; i++){ scanf("%d%d", &x, &y); PQ.push(PII(0,x*(W + 1) + y)); D[x][y] = 0, P[x][y] = i; par[i] = i; } while (!PQ.empty()){ t = PQ.top(); PQ.pop(); BFS(t.Y / (W + 1), t.Y % (W + 1), -t.X); } for (i = 1; i <= n; i++){ for (j = 1; j <= n; j++){ if (P[i][j] && P[i][j + 1] && P[i][j] != P[i][j + 1]){ Ed[cnt].a = P[i][j], Ed[cnt].b = P[i][j + 1], Ed[cnt].d = D[i][j] + D[i][j + 1]; cnt++; } if (P[i][j] && P[i + 1][j] && P[i][j] != P[i + 1][j]){ Ed[cnt].a = P[i][j], Ed[cnt].b = P[i + 1][j], Ed[cnt].d = D[i][j] + D[i + 1][j]; cnt++; } } } sort(Ed, Ed + cnt); for (i = 0; i < cnt; i++){ Connect(Ed[i].a, Ed[i].b, Ed[i].d); } for (i = 1; i <= n; i++){ if (!pp[0][i])DFS(i, 0); } for (i = 1; i < 18; i++){ for (j = 1; j <= n; j++){ pp[i][j] = pp[i - 1][pp[i - 1][j]]; LL[i][j] = max(LL[i - 1][j], LL[i - 1][pp[i - 1][j]]); } } while (Query--) { scanf("%d%d", &x, &y); printf("%d\n", Gap(x, y)); } }
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