oj.uz

Submission #911574

# Submission time Handle Problem Language Result Execution time Memory
911574 2024-01-19T04:07:54 Z lighton Street Lamps (APIO19_street_lamps) C++17
100 / 100
 1076 ms 48552 KB 
#include <bits/stdc++.h>
#define forf(i,a,b) for(int i = a; i<=b; i++)
#define all(v) v.begin(),v.end()
using namespace std;
typedef long long ll;
int N,M,Q;
char S[300001];
struct Interval{
    int s,e,ts,te;
}; vector<Interval> ints;

map<int,int> stkeyf,stkeyb;
map<int,int> enkeyf,enkeyb;
void ins(int s, int e, int t){
    int now = ints.size();
    ints.push_back({s,e, t, -1});
    stkeyf.insert({s, now});
    stkeyb.insert({-s, now});
    enkeyf.insert({e, now});
    enkeyb.insert({-e, now});
}
void ers(int ind ,int t){
    ints[ind].te = t;
    int a = ints[ind].s;
    int b = ints[ind].e;
    stkeyf.erase(stkeyf.lower_bound(a));
    stkeyb.erase(stkeyb.lower_bound(-a));
    enkeyf.erase(enkeyf.lower_bound(b));
    enkeyb.erase(enkeyb.lower_bound(-b));
}

struct Event{
    int t;
    int q;
    int s,e,v;
    bool operator<(const Event &r) const{
        if(t==r.t){
            if(q==r.q) return s<r.s;
            return q>r.q;
        }
        return t<r.t;
    }
}; vector<Event> events;

int isq[300001];
int ans[300001];

struct Seg{
    int arr[300005];
    void update(int f, int x){ for(int i = f; i<=Q+3; i += i&-i) arr[i]+=x;}
    int query(int f){
        int ret = 0;
        for(int i = f; i; i-=i&-i) ret += arr[i];
        return ret;
    }
    int query(int s, int e){ return query(e)-query(s-1);}
} seg;

struct Event2{
    int x,y,q,v,id;
    bool operator<(const Event2 &r) const{
        if(x==r.x){
            if(q==r.q) return id<r.id;
            return q<r.q;
        }
        return x<r.x;
    }
};

void dnc(int s, int e){
    if(s==e) return;
    int m = s+e>>1;
    vector<Event2> events2;
    forf(i,s,m){
        if(events[i].q == 0) events2.push_back({events[i].s,events[i].e,0,events[i].v,i});
    }
    forf(i,m+1,e){
        if(events[i].q == 1) events2.push_back({events[i].s,events[i].e,1,0,events[i].t});
    }
    sort(all(events2));

    for(auto i : events2){
        if(i.q == 0) seg.update(i.y,i.v);
        else ans[i.id] += seg.query(i.y,Q+2);
    }
    for(auto i : events2) if(i.q == 0) seg.update(i.y,-i.v);
    dnc(s,m);
    dnc(m+1,e);
}

int main(){
    scanf("%d %d" , &N,&Q);
    scanf("%s" ,S); S[N] = '0';

    {
        int l = 1;
        forf(i, 1, N) {
            if (S[i - 1] == '0' && S[i] == '1') l = i+1;
            if (S[i - 1] == '1' && S[i] == '0') {
                ins(l,i,1);
            }
        }
    }

    forf(i,2,Q+1){ // t = i
        char s[10]; int a,b;
        scanf("%s" , s);
        if(s[0] == 'q'){
            isq[i] = 1;
            scanf("%d %d" , &a,&b); b--;
            events.push_back({i,1,a,b});
            if(enkeyf.lower_bound(b) != enkeyf.end()) {
                int ind = enkeyf.lower_bound(b)->second;
                if (ints[ind].s <= a && b <= ints[ind].e) ans[i] += (i - ints[ind].ts);
            }
        }
        else{
            scanf("%d" , &a);
            if(S[a-1] == '0'){
                S[a-1] = '1';
                int l = a, r = a;
                if(enkeyb.lower_bound(-a) != enkeyb.end()) {
                    int indl = enkeyb.lower_bound(-a)->second;
                    if (ints[indl].e + 1 == a) {
                        ers(indl, i - 1);
                        l = ints[indl].s;
                    }
                }

                if(stkeyf.lower_bound(a) != stkeyf.end()) {
                    int indr = stkeyf.lower_bound(a)->second;
                    if (ints[indr].s - 1 == a) {
                        ers(indr, i - 1);
                        r = ints[indr].e;
                    }
                }

                ins(l,r,i);
            }
            else{
                S[a-1] = '0';
                int ind = enkeyf.lower_bound(a)->second;
                ers(ind,i-1);
                if(ints[ind].s < a) ins(ints[ind].s , a-1 , i);
                if(ints[ind].e > a) ins(a+1 , ints[ind].e , i);
            }
        }
    }

    for(auto i : ints){
        if(i.te != -1) events.push_back({i.te,0,i.s,i.e,i.te-i.ts+1});
    }
    sort(all(events));
    dnc(0,events.size()-1);

    forf(i,1,Q+1){
        if(isq[i]) printf("%d\n" , ans[i]);
    }
}

Compilation message

street_lamps.cpp: In function 'void dnc(int, int)':
street_lamps.cpp:72:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   72 |     int m = s+e>>1;
      |             ~^~
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:92:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |     scanf("%d %d" , &N,&Q);
      |     ~~~~~^~~~~~~~~~~~~~~~~
street_lamps.cpp:93:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |     scanf("%s" ,S); S[N] = '0';
      |     ~~~~~^~~~~~~~~
street_lamps.cpp:107:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  107 |         scanf("%s" , s);
      |         ~~~~~^~~~~~~~~~
street_lamps.cpp:110:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  110 |             scanf("%d %d" , &a,&b); b--;
      |             ~~~~~^~~~~~~~~~~~~~~~~
street_lamps.cpp:118:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  118 |             scanf("%d" , &a);
      |             ~~~~~^~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Correct 1 ms 2500 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2392 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 458 ms 20888 KB Output is correct
2 Correct 485 ms 28988 KB Output is correct
3 Correct 522 ms 28092 KB Output is correct
4 Correct 823 ms 46264 KB Output is correct
5 Correct 912 ms 38148 KB Output is correct
6 Correct 888 ms 48552 KB Output is correct
7 Correct 293 ms 26036 KB Output is correct
8 Correct 294 ms 29124 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2396 KB Output is correct
2 Correct 3 ms 2396 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2396 KB Output is correct
5 Correct 1076 ms 32868 KB Output is correct
6 Correct 1022 ms 40044 KB Output is correct
7 Correct 800 ms 34452 KB Output is correct
8 Correct 313 ms 26828 KB Output is correct
9 Correct 167 ms 16052 KB Output is correct
10 Correct 187 ms 21216 KB Output is correct
11 Correct 190 ms 21840 KB Output is correct
12 Correct 295 ms 24496 KB Output is correct
13 Correct 301 ms 28676 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2392 KB Output is correct
2 Correct 2 ms 2396 KB Output is correct
3 Correct 2 ms 2396 KB Output is correct
4 Correct 2 ms 2396 KB Output is correct
5 Correct 572 ms 37624 KB Output is correct
6 Correct 717 ms 47520 KB Output is correct
7 Correct 862 ms 47880 KB Output is correct
8 Correct 1034 ms 42428 KB Output is correct
9 Correct 510 ms 32580 KB Output is correct
10 Correct 546 ms 27600 KB Output is correct
11 Correct 505 ms 31564 KB Output is correct
12 Correct 529 ms 27068 KB Output is correct
13 Correct 509 ms 29976 KB Output is correct
14 Correct 532 ms 28696 KB Output is correct
15 Correct 292 ms 25776 KB Output is correct
16 Correct 308 ms 26800 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Correct 1 ms 2500 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2392 KB Output is correct
8 Correct 458 ms 20888 KB Output is correct
9 Correct 485 ms 28988 KB Output is correct
10 Correct 522 ms 28092 KB Output is correct
11 Correct 823 ms 46264 KB Output is correct
12 Correct 912 ms 38148 KB Output is correct
13 Correct 888 ms 48552 KB Output is correct
14 Correct 293 ms 26036 KB Output is correct
15 Correct 294 ms 29124 KB Output is correct
16 Correct 2 ms 2396 KB Output is correct
17 Correct 3 ms 2396 KB Output is correct
18 Correct 2 ms 2396 KB Output is correct
19 Correct 2 ms 2396 KB Output is correct
20 Correct 1076 ms 32868 KB Output is correct
21 Correct 1022 ms 40044 KB Output is correct
22 Correct 800 ms 34452 KB Output is correct
23 Correct 313 ms 26828 KB Output is correct
24 Correct 167 ms 16052 KB Output is correct
25 Correct 187 ms 21216 KB Output is correct
26 Correct 190 ms 21840 KB Output is correct
27 Correct 295 ms 24496 KB Output is correct
28 Correct 301 ms 28676 KB Output is correct
29 Correct 2 ms 2392 KB Output is correct
30 Correct 2 ms 2396 KB Output is correct
31 Correct 2 ms 2396 KB Output is correct
32 Correct 2 ms 2396 KB Output is correct
33 Correct 572 ms 37624 KB Output is correct
34 Correct 717 ms 47520 KB Output is correct
35 Correct 862 ms 47880 KB Output is correct
36 Correct 1034 ms 42428 KB Output is correct
37 Correct 510 ms 32580 KB Output is correct
38 Correct 546 ms 27600 KB Output is correct
39 Correct 505 ms 31564 KB Output is correct
40 Correct 529 ms 27068 KB Output is correct
41 Correct 509 ms 29976 KB Output is correct
42 Correct 532 ms 28696 KB Output is correct
43 Correct 292 ms 25776 KB Output is correct
44 Correct 308 ms 26800 KB Output is correct
45 Correct 253 ms 16420 KB Output is correct
46 Correct 289 ms 15472 KB Output is correct
47 Correct 394 ms 22316 KB Output is correct
48 Correct 847 ms 43976 KB Output is correct
49 Correct 231 ms 23036 KB Output is correct
50 Correct 216 ms 25852 KB Output is correct
51 Correct 213 ms 22444 KB Output is correct
52 Correct 219 ms 22700 KB Output is correct
53 Correct 230 ms 23460 KB Output is correct
54 Correct 249 ms 23872 KB Output is correct