当我看到题目是5秒的时候,压根没有想树状数组,一直奔着模拟队列去想了,最后也没搞定,赛后看到大神的题解才恍然大悟,原来如此,题目中有明显的暗示,求前n项和,骤然感叹,自己太low...
果然还是要多做多研究啊,下面是代码,还有一处脑残错误在代码里...当时真的是找了好久才发现...
#include <cstdio> #include <cmath> #include <iostream> #include <algorithm> #include <queue> #include <map> #include <cstring> using namespace std; #define maxn 100005 int c[maxn],mark[maxn],n; int lowbit(int k) { return k&(-k); } void update(int x,int v)///把树状数组的上界写了变量num,wa了无数次 { while(x <= n) { c[x] += v; x += lowbit(x); } } int cal(int x) { int ans = 0; while(x > 0) { ans += c[x]; x -= lowbit(x); } return ans; } struct Node { int n,y; friend bool operator < (Node a,Node b) { return a.y > b.y; } }; int main() { int t,top,num,x,y; Node tmp; char op[20]; while(~scanf("%d",&t)) { n = t; top = 1,num = 1; memset(c,0,sizeof(c)); memset(mark,0,sizeof(mark)); map<int,int> pos; priority_queue<Node>que; while(!que.empty()) que.pop(); while(t--) { scanf("%s",op); if(op[0] == ‘a‘) { scanf("%d%d",&x,&y); tmp.n = num,tmp.y = y; que.push(tmp); pos[x] = num; mark[num] = 1; num++; } else if(op[0] == ‘p‘) { while(mark[top] == 0 && top <= num) top++; if(top > num)continue; mark[top] = 0; update(top,-1); } else if(op[0] == ‘l‘) { while(!que.empty() && mark[que.top().n] == 0) { que.pop(); } if(!que.empty()) { Node now; now = que.top(); que.pop(); mark[now.n] = 0; update(now.n,-1); } } else if(op[0] == ‘c‘) { scanf("%d%d",&x,&y); int m = pos[x]; if(pos[x] == 0) continue; if(mark[m] == 0) continue; int tot = m - 1 + cal(pos[x]-1); printf("%d\n",tot); if(tot > y) { mark[m] = 0; update(m,-1); } } } } return 0; }
时间: 2024-10-12 08:59:25