1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142
| #include <bits/stdc++.h> #define MAXN 500005 using namespace std; inline int read() { int x=0,f=1; char ch=getchar(); while (ch<'0'||ch>'9') { if (ch=='-') f=-1; ch=getchar(); } while (ch>='0'&&ch<='9') { x=(x*10)+(ch-'0'); ch=getchar(); } return x*f; } namespace FHQ_Treap{ struct node{ int l,r; int val; int pri; int sz; }tree[MAXN]; int tot; #define lc(i) tree[i].l #define rc(i) tree[i].r inline void Update(int x){ tree[x].sz=tree[lc(x)].sz+tree[rc(x)].sz+1; } inline int New(int v){ tree[++tot].val=v; tree[tot].pri=rand(); tree[tot].sz=1; return tot; } int Merge(int x,int y){ if (!x||!y) return x+y; if (tree[x].pri<tree[y].pri){ rc(x)=Merge(rc(x),y),Update(x); return x; } else { lc(y)=Merge(x,lc(y)),Update(y); return y; } } void Split(int i,int k,int &x,int &y){ if (!i){ x=y=0; } else { if (tree[i].val<=k){x=i,Split(rc(i),k,rc(i),y);} else{y=i,Split(lc(i),k,x,lc(i));} Update(i); } } int kth(int i,int k){ while (true){ if (k<=tree[lc(i)].sz){ i=lc(i); } else if (k==tree[lc(i)].sz+1){ return i; } else{ k-=tree[lc(i)].sz+1; i=rc(i); } } } int root,x,y,z; void Init(){ tot=0; memset(tree,0,sizeof(tree)); root=0; srand(19260817); } inline void Add(int num){ Split(root,num,x,y); root=Merge(Merge(x,New(num)),y); } inline void Del(int num){ Split(root,num,x,z); Split(x,num-1,x,y); y=Merge(lc(y),rc(y)); root=Merge(Merge(x,y),z); } #define Get_K(rt,rk) tree[kth(rt,rk)].val inline int Kth(int k){ if (tree[root].sz<k) return -1; return Get_K(root,tree[root].sz-k+1); } inline int Pre(int num){ Split(root,num-1,x,y); int temp=Get_K(x,tree[x].sz); root=Merge(x,y); return temp; } inline int Delete_Pre(int num){ Split(root,num-1,x,y); root=y; return tree[x].sz; } }; using namespace FHQ_Treap; #define INF 0x3f3f3f3f inline char gc(){ char ch=getchar(); while (ch!='I'&&ch!='A'&&ch!='S'&&ch!='F') ch=getchar(); return ch; } int main(){ Init(); int n=read(),Min=read(); int tag=0; int sum=0; while (n--){ char opr=gc(); int num=read(); if (opr=='I'){ if (num<Min){continue;} Add(num-tag); } else if (opr=='A'){ tag+=num; } else if (opr=='S'){ tag-=num; sum+=Delete_Pre(Min-tag); } else if (opr=='F'){ int ans=Kth(num); if (ans==-1) printf("-1\n"); else printf("%d\n",ans+tag); } } printf("%d\n",sum); }
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