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题目描述
输入
输出
样例输入
11 10000
query 5
construct 5 500 100
query 500
query 1000
construct 10 90 5
query 44
destruct 44 66
query 55
construct 50 60 3
query 46
query 6000
样例输出
0
975
0
9999
9775
9984
0
提示
题解
这道题给你三种操作(这道题用set维护区间)
对于construct操作,我们可以发现加入的区间要么和所有的区间都不相交,要么就是区间的大小比某个区间的v还要小
construct操作读入的x,y我们可以可以把y改成x+(y-x)/v*v(最后一个信号站的位置)
对于destruct操作,我们判断一下左右端点是否把其他的区间截断了
对于query操作,我们只要找一下离这个点最近的一个区间就可以了
具体细节可以看一下代码
1 #include<bits/stdc++.h> 2 #define ll long long 3 using namespace std; 4 struct node{ 5 int x,y,v; 6 bool operator <(const node &a) const{ 7 return x<a.x; 8 } 9 }; 10 typedef multiset<node>::iterator It; 11 int m,l,r,v,x,y; 12 ll c; 13 char s[20]; 14 multiset<node> q; 15 int calc(int x,int y,int v){ return x+(y-x)/v*v; } 16 void solve_c(){ 17 scanf("%d%d%d",&x,&y,&v); 18 y=calc(x,y,v); 19 It point=q.upper_bound((node){x,0,0}); 20 if (point!=q.begin()){ 21 point--; 22 int st=point->x,ed=point->y; 23 if (st<x&&ed>y){ 24 int stp=point->v; 25 q.erase(point); 26 q.insert((node){st,calc(st,x,stp),stp}); 27 if (st!=ed) 28 q.insert((node){calc(st,x,stp)+stp,ed,stp}); 29 } 30 } 31 q.insert((node){x,y,v}); 32 } 33 void solve_d(){ 34 scanf("%d%d",&x,&y); 35 It point=q.lower_bound((node){x,0,0}); 36 if (point!=q.begin()){ 37 point--; 38 int st=point->x,ed=point->y; 39 if (st<x&&ed>=x){ 40 int stp=point->v; 41 q.erase(point); 42 q.insert((node){st,calc(st,x-1,stp),stp}); 43 if (ed>y) 44 q.insert((node){calc(st,r,stp)+stp,ed,stp}); 45 } 46 } 47 point=q.upper_bound((node){y,0,0}); 48 if (point!=q.begin()){ 49 point--; 50 int st=point->x,ed=point->y; 51 if (st<=y&&ed>y){ 52 int stp=point->v; 53 q.erase(point); 54 q.insert((node){calc(st,y,stp)+stp,ed,stp}); 55 } 56 } 57 q.erase(q.lower_bound((node){x,0,0}),q.upper_bound((node){y,0,0})); 58 } 59 void solve_q(){ 60 scanf("%d",&x); 61 int d=1e9; 62 It point=q.lower_bound((node){x,0,0}); 63 if (point!=q.end()) d=min(d,point->x-x); 64 if (point!=q.begin()){ 65 point--; 66 int st=point->x,ed=point->y; 67 if (ed>=x){ 68 int stp=point->v; 69 d=min(d,x-calc(st,x,stp)); 70 if (st!=ed) d=min(d,calc(st,x,stp)+stp-x); 71 } else d=min(d,x-point->y); 72 } 73 if (d==1e9) puts("0"); 74 else printf("%lld\n",max(0ll,c-(ll)d*d)); 75 } 76 int main(){ 77 scanf("%d%lld",&m,&c); 78 for (int i=1;i<=m;i++){ 79 scanf("%s",s); 80 if (s[0]=='q') solve_q(); else 81 if (s[0]=='c') solve_c(); else 82 if (s[0]=='d') solve_d(); 83 } 84 return 0; 85 }