oj.uz

Submission #307710

# Submission time Handle Problem Language Result Execution time Memory
307710 2020-09-29T07:34:01 Z noclever Street Lamps (APIO19_street_lamps) C++14
100 / 100
 1522 ms 46220 KB 
#include<bits/stdc++.h>
#define ll long long
#define N 300005

using namespace std;
inline int Get() {int x=0,f=1;char ch=getchar();while(ch<'0'||ch>'9') {if(ch=='-') f=-1;ch=getchar();}while('0'<=ch&&ch<='9') {x=(x<<1)+(x<<3)+ch-'0';ch=getchar();}return x*f;}

int n,m;
char s[N];
struct interval {
	int lp,rp;
	int l,r;
	interval() {}
	interval(int _lp,int _rp,int _l,int _r) {lp=_lp,rp=_rp,l=_l,r=_r;}
	bool operator <(const interval &a)const {return rp<a.rp;}
}t[N<<2];

set<int>pos;
set<int>::iterator it;
int id[N],R[N];
int tot;
int ans[N];

struct query {
	int l,r,tim,id;
}q[N];

int qt;
struct node {
	int op,id,r;
	node() {}
	node(int _op,int _id,int _r) {
		op=_op,id=_id,r=_r;
	}
};

bool cmpr(const node &a,const node &b) {
	if(a.r!=b.r) return a.r>b.r;
	return a.op<b.op;
}

bool cmpl(const node &a,const node &b) {
	if(a.op!=b.op) return a.op<b.op;
	if(a.op==1) return t[a.id].lp<t[b.id].lp;
	else return q[a.id].l<q[b.id].l;
}

node st[N<<2];
int top;

struct tree {
	int l,r;
	int sum,tag;
}tr[N<<2];

void update(int v) {tr[v].sum=tr[v<<1].sum+tr[v<<1|1].sum;}
void Add(int v,int f) {tr[v].sum+=(tr[v].r-tr[v].l+1)*f,tr[v].tag+=f;}
void down(int v) {
	if(tr[v].tag) {
		Add(v<<1,tr[v].tag);
		Add(v<<1|1,tr[v].tag);
		tr[v].tag=0;
	}
}
void build(int v,int l,int r) {
	tr[v].l=l,tr[v].r=r;
	if(l==r) return ;
	int mid=l+r>>1;
	build(v<<1,l,mid),build(v<<1|1,mid+1,r);
}

void Modify(int v,int l,int r,int f) {
	if(tr[v].l>r||tr[v].r<l) return ;
	if(l<=tr[v].l&&tr[v].r<=r) {
		Add(v,f);
		return ;
	}
	down(v);
	Modify(v<<1,l,r,f),Modify(v<<1|1,l,r,f);
	update(v);
}

int query(int v,int l,int r) {
	if(tr[v].l>r||tr[v].r<l) return 0;
	if(l<=tr[v].l&&tr[v].r<=r) return tr[v].sum;
	down(v);
	return query(v<<1,l,r)+query(v<<1|1,l,r);
}

void solve(int l,int r) {
	if(l==r) return ;
	int mid=l+r>>1;
	solve(l,mid),solve(mid+1,r);
	int tag=l;
	for(int i=mid+1;i<=r;i++) {
		if(st[i].op==1) continue ;
		while(tag<=mid&&st[tag].op==1&&t[st[tag].id].lp<=q[st[i].id].l) {
			Modify(1,t[st[tag].id].l,t[st[tag].id].r,1);
			tag++;
		}
		ans[st[i].id]+=query(1,1,q[st[i].id].tim);
	}
	for(int i=l;i<tag;i++) Modify(1,t[st[i].id].l,t[st[i].id].r,-1);
	inplace_merge(st+l,st+mid+1,st+r+1,cmpl);
}

int main() {
	n=Get(),m=Get();
	scanf("%s",s+1);
	char op[20];
	build(1,1,m);
	for(int i=1;i<=n;i++) {
		if(s[i]=='0') continue ;
		int j;
		for(j=i;j<=n&&s[j]=='1';j++);
		j--;
		R[i]=j;
		pos.insert(i);
		t[id[i]=++tot]=interval(i,j,1,m);
		i=j;
	}
	
	for(int i=1;i<=m;i++) {
		scanf("%s",op+1);
		int x;
		if(op[1]=='t') {
			x=Get();
			if(i==m) continue ;
			s[x]^=1;
			if(s[x]=='0') {
				it=pos.upper_bound(x);it--;
				int LL=*it,RR=R[LL];
				t[id[LL]].r=i;
				if(LL<x) {
					t[id[LL]=++tot]=interval(LL,x-1,i+1,m);
					R[LL]=x-1;
				} else pos.erase(LL);
				if(x<RR) {
					t[id[x+1]=++tot]=interval(x+1,RR,i+1,m);
					R[x+1]=RR;
					pos.insert(x+1);
				}
			} else {
				int nowl=x,nowr=x;
				it=pos.upper_bound(x);
				if(it!=pos.end()) {
					int y=*it;
					if(y==x+1) {
						nowr=R[y];
						t[id[y]].r=i;
						pos.erase(y);
					}
				}
				it=pos.lower_bound(x);
				if(it!=pos.begin()) {
					int y=*(--it);
					if(R[y]==x-1) {
						nowl=y;
						t[id[y]].r=i;
						pos.erase(y);
					}
				}
				t[id[nowl]=++tot]=interval(nowl,nowr,i+1,m);
				R[nowl]=nowr;
				pos.insert(nowl);
			}
		} else {
			q[++qt].l=Get(),q[qt].r=Get()-1;
			q[qt].id=qt,q[qt].tim=i;
		}
	}
	for(int i=1;i<=tot;i++) {
		st[++top]=node(1,i,t[i].rp);
	}
	for(int i=1;i<=qt;i++) {
		st[++top]=node(2,i,q[i].r);
	}
	sort(st+1,st+1+top,cmpr);
	solve(1,top);
	for(int i=1;i<=qt;i++) cout<<ans[i]<<"\n";
	return 0;
}

Compilation message

street_lamps.cpp: In function 'void build(int, int, int)':
street_lamps.cpp:68:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   68 |  int mid=l+r>>1;
      |          ~^~
street_lamps.cpp: In function 'void solve(int, int)':
street_lamps.cpp:92:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   92 |  int mid=l+r>>1;
      |          ~^~
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:109:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  109 |  scanf("%s",s+1);
      |  ~~~~~^~~~~~~~~~
street_lamps.cpp:124:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  124 |   scanf("%s",op+1);
      |   ~~~~~^~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1326 ms 30832 KB Output is correct
2 Correct 1332 ms 34404 KB Output is correct
3 Correct 1350 ms 35144 KB Output is correct
4 Correct 1223 ms 45708 KB Output is correct
5 Correct 1522 ms 43144 KB Output is correct
6 Correct 1077 ms 45324 KB Output is correct
7 Correct 1359 ms 37856 KB Output is correct
8 Correct 1376 ms 37888 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 2 ms 512 KB Output is correct
3 Correct 2 ms 512 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 532 ms 33620 KB Output is correct
6 Correct 842 ms 42280 KB Output is correct
7 Correct 1118 ms 42236 KB Output is correct
8 Correct 1446 ms 37832 KB Output is correct
9 Correct 802 ms 23384 KB Output is correct
10 Correct 940 ms 33100 KB Output is correct
11 Correct 905 ms 32096 KB Output is correct
12 Correct 1455 ms 37728 KB Output is correct
13 Correct 1436 ms 37856 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 512 KB Output is correct
2 Correct 2 ms 512 KB Output is correct
3 Correct 2 ms 512 KB Output is correct
4 Correct 1 ms 512 KB Output is correct
5 Correct 1496 ms 41152 KB Output is correct
6 Correct 1141 ms 46220 KB Output is correct
7 Correct 839 ms 45292 KB Output is correct
8 Correct 558 ms 44428 KB Output is correct
9 Correct 1033 ms 34152 KB Output is correct
10 Correct 958 ms 33260 KB Output is correct
11 Correct 1032 ms 34148 KB Output is correct
12 Correct 947 ms 33380 KB Output is correct
13 Correct 1032 ms 34144 KB Output is correct
14 Correct 939 ms 33260 KB Output is correct
15 Correct 1428 ms 37852 KB Output is correct
16 Correct 1451 ms 37728 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1326 ms 30832 KB Output is correct
9 Correct 1332 ms 34404 KB Output is correct
10 Correct 1350 ms 35144 KB Output is correct
11 Correct 1223 ms 45708 KB Output is correct
12 Correct 1522 ms 43144 KB Output is correct
13 Correct 1077 ms 45324 KB Output is correct
14 Correct 1359 ms 37856 KB Output is correct
15 Correct 1376 ms 37888 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 2 ms 512 KB Output is correct
18 Correct 2 ms 512 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 532 ms 33620 KB Output is correct
21 Correct 842 ms 42280 KB Output is correct
22 Correct 1118 ms 42236 KB Output is correct
23 Correct 1446 ms 37832 KB Output is correct
24 Correct 802 ms 23384 KB Output is correct
25 Correct 940 ms 33100 KB Output is correct
26 Correct 905 ms 32096 KB Output is correct
27 Correct 1455 ms 37728 KB Output is correct
28 Correct 1436 ms 37856 KB Output is correct
29 Correct 2 ms 512 KB Output is correct
30 Correct 2 ms 512 KB Output is correct
31 Correct 2 ms 512 KB Output is correct
32 Correct 1 ms 512 KB Output is correct
33 Correct 1496 ms 41152 KB Output is correct
34 Correct 1141 ms 46220 KB Output is correct
35 Correct 839 ms 45292 KB Output is correct
36 Correct 558 ms 44428 KB Output is correct
37 Correct 1033 ms 34152 KB Output is correct
38 Correct 958 ms 33260 KB Output is correct
39 Correct 1032 ms 34148 KB Output is correct
40 Correct 947 ms 33380 KB Output is correct
41 Correct 1032 ms 34144 KB Output is correct
42 Correct 939 ms 33260 KB Output is correct
43 Correct 1428 ms 37852 KB Output is correct
44 Correct 1451 ms 37728 KB Output is correct
45 Correct 640 ms 19808 KB Output is correct
46 Correct 759 ms 20268 KB Output is correct
47 Correct 556 ms 24344 KB Output is correct
48 Correct 991 ms 45700 KB Output is correct
49 Correct 1080 ms 35040 KB Output is correct
50 Correct 1085 ms 35168 KB Output is correct
51 Correct 1061 ms 35400 KB Output is correct
52 Correct 925 ms 35552 KB Output is correct
53 Correct 920 ms 35424 KB Output is correct
54 Correct 924 ms 35548 KB Output is correct