要学会建堆,然后知道用数组模拟堆的优点。
#include #include #include using namespace std; const int N = 1010; int heap[N]; int n, m; void insert(int pos, int x) // 建堆 { heap[pos] = x; while(pos > 1) { if(heap[pos] < heap[pos >> 1]) { swap(heap[pos], heap[pos >> 1]); pos >>= 1; } else { break; } } } int main() { cin >> n >> m; map<int,int>p; // 用map 来 记录每个节点对应在数组中的下标 for(int i = 1; i <= n; i++) { int x; cin >> x; insert(i, x); } for(int i = 1; i <= n; i++) p[heap[i]] = i; while(m--) { string s; int x, y, flag = 0; cin >> x >> s; if(s == "and") { // 根据每句话的特性来判断。 我觉得这非常妙 cin >> y >> s >> s; if(heap[p[x] ^ 1] == y) flag = 1; } else { cin >> s; if(s == "a") { cin >> s >> s >> y; if(heap[p[x] >> 1] == y) flag = 1; } else { cin >> s; if(s == "root") { if(heap[1] == x) flag = 1; } else { cin >> s >> y; if(heap[p[y] >> 1] == x) flag = 1; } } } if(flag) cout << "T" << endl; else cout << "F" << endl; } return 0; }