oj.uz

Submission #498407

# Submission time Handle Problem Language Result Execution time Memory
498407 2021-12-25T06:30:19 Z ryangohca Street Lamps (APIO19_street_lamps) C++17
100 / 100
 1181 ms 75316 KB 
#include <bits/stdc++.h>
#define pii pair<int, int>
#define ti3 tuple<int, int, int>
#define ti4 tuple<int, int, int, int>
#define int long long
// Honestly, I love you, to the mysterious (SinB) place   ~ SinB, Sunny Summer
using namespace std;
const int N = 300005;
int fw[N+1];
void update(int x, int v) {
    for (; x<=N; x+=x&(-x)) fw[x] += v; 
}
int sum(int x) {
    int res = 0;
    for(; x; x-=x&(-x)) res += fw[x];
    return res;
}
set<pii> ranges;
vector<ti4> queries; // l,r,v/idx,isquery
int ans[300005];
void dnc(int s, int e){
    if (s >= e) return;
    int m = (s+e)/2;
    vector<ti3> upds;
    vector<ti3> qry;
    for (int i = s; i <= m; i++){
        auto [a, b, v, t] = queries[i];
        if (t == 0){
            upds.push_back({a, a, v});
            upds.push_back({b+1, a, -v});
        }
    }
    for (int i = m+1; i <= e; i++){
        auto [a, b, v, t] = queries[i];
        if (t == 1){
            qry.push_back({b, a, v});
        }
    }
    if (upds.empty() || qry.empty()){
        if (upds.empty() && !qry.empty()){
            // left side all queries, no use go there
            dnc(m+1, e);
        }
        if (qry.empty() && !upds.empty()){
            // right side all updates, no use go there
            dnc(s, m);
        }
        return;
    } else {
        sort(qry.begin(), qry.end());
        sort(upds.begin(), upds.end());
        int uidx = 0;
        for (auto [e, s, idx] : qry){
            while (uidx != upds.size() && get<0>(upds[uidx]) <= e){
                update(get<1>(upds[uidx]), get<2>(upds[uidx]));
                uidx++;
            }
            ans[idx] += sum(s);
        }
        // revert changes
        for (int i = uidx - 1; i >= 0; i--){
            update(get<1>(upds[i]), -get<2>(upds[i]));
        }
        dnc(s, m); dnc(m+1, e);
    }
}
main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    memset(ans, -1, sizeof ans);
    int n, q; cin >> n >> q;
    string s; cin >> s; s += '0';
    int lst = -1;
    for (int i = 1; i <= n+1; i++){
        if (s[i-1] == '1'){
            if (lst == -1) lst = i;
        } else {
            if (lst == -1) continue;
            ranges.insert({lst, i-1});
            // queries.push_back({lst, i-1, -0, 0}); // no effect
            lst = -1;
        }
    }
    for (int t = 1; t <= q; t++){
        string evt; cin >> evt;
        if (evt[0] == 'q'){
            ans[t] = 0;
            int a, b; cin >> a >> b; b--;
            // check if {a, b} is in some range alr
            auto itr = ranges.lower_bound({a, INT_MAX});
            if (itr != ranges.begin()){
                itr--;
                // itr->first <= a
                if (itr->second >= b){
                    ans[t] += t;
                }
            }
            queries.push_back({a, b, t, 1});
        } else {
            int x; cin >> x;
            if (s[x-1] == '0'){
                auto itr = ranges.lower_bound({x, 0});
                int ns = x, ne = x;
                if (itr != ranges.begin()){
                    auto prv = prev(itr);
                    if (prv->second == x - 1){
                        ns = prv->first;
                        queries.push_back({ns, prv->second, t, 0});
                        ranges.erase(prv);
                    }
                }
                if (itr != ranges.end()){
                    if (itr->first == x + 1){
                        ne = itr->second;
                        queries.push_back({itr->first, ne, t, 0});
                        ranges.erase(itr);
                    }
                }
                queries.push_back({ns, ne, -t, 0});
                ranges.insert({ns, ne});
            } else {
                auto itr = ranges.lower_bound({x, INT_MAX});
                itr--;
                if ((x-1) - itr->first >= 0){
                    queries.push_back({itr->first, x-1, -t, 0});
                    ranges.insert({itr->first, x-1});
                }
                if (itr->second - (x + 1) >= 0){
                    queries.push_back({x+1, itr->second, -t, 0});
                    ranges.insert({x+1, itr->second});
                }
                queries.push_back({itr->first, itr->second, t, 0});
                ranges.erase(itr);
            }
            s[x-1] = (s[x-1] == '0'? '1': '0');
        }
    }
    //for (auto [a, b, c, d]: queries) cout << a << ' ' << b << ' ' << c << ' ' << d << endl;
    dnc(0, queries.size()-1);
    for (int i = 1; i <= q; i++){
        if (ans[i] != -1) cout << ans[i] << '\n'; 
    }
}

Compilation message

street_lamps.cpp: In function 'void dnc(long long int, long long int)':
street_lamps.cpp:54:25: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::tuple<long long int, long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |             while (uidx != upds.size() && get<0>(upds[uidx]) <= e){
      |                    ~~~~~^~~~~~~~~~~~~~
street_lamps.cpp: At global scope:
street_lamps.cpp:67:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   67 | main(){
      | ^~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2656 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 1 ms 2636 KB Output is correct
6 Correct 1 ms 2672 KB Output is correct
7 Correct 2 ms 2680 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1181 ms 44892 KB Output is correct
2 Correct 1084 ms 44504 KB Output is correct
3 Correct 885 ms 46004 KB Output is correct
4 Correct 885 ms 53488 KB Output is correct
5 Correct 911 ms 50880 KB Output is correct
6 Correct 411 ms 60424 KB Output is correct
7 Correct 109 ms 28496 KB Output is correct
8 Correct 116 ms 29952 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2804 KB Output is correct
2 Correct 4 ms 2812 KB Output is correct
3 Correct 3 ms 2816 KB Output is correct
4 Correct 2 ms 2684 KB Output is correct
5 Correct 1014 ms 70264 KB Output is correct
6 Correct 1126 ms 60412 KB Output is correct
7 Correct 889 ms 50948 KB Output is correct
8 Correct 127 ms 29872 KB Output is correct
9 Correct 142 ms 21388 KB Output is correct
10 Correct 181 ms 25796 KB Output is correct
11 Correct 157 ms 25876 KB Output is correct
12 Correct 116 ms 28480 KB Output is correct
13 Correct 113 ms 29904 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2676 KB Output is correct
2 Correct 2 ms 2892 KB Output is correct
3 Correct 2 ms 2800 KB Output is correct
4 Correct 3 ms 2804 KB Output is correct
5 Correct 296 ms 37716 KB Output is correct
6 Correct 375 ms 55320 KB Output is correct
7 Correct 434 ms 60404 KB Output is correct
8 Correct 466 ms 75316 KB Output is correct
9 Correct 375 ms 55568 KB Output is correct
10 Correct 397 ms 66152 KB Output is correct
11 Correct 393 ms 55472 KB Output is correct
12 Correct 381 ms 66180 KB Output is correct
13 Correct 351 ms 55500 KB Output is correct
14 Correct 377 ms 66352 KB Output is correct
15 Correct 110 ms 28596 KB Output is correct
16 Correct 111 ms 29936 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2656 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 1 ms 2636 KB Output is correct
6 Correct 1 ms 2672 KB Output is correct
7 Correct 2 ms 2680 KB Output is correct
8 Correct 1181 ms 44892 KB Output is correct
9 Correct 1084 ms 44504 KB Output is correct
10 Correct 885 ms 46004 KB Output is correct
11 Correct 885 ms 53488 KB Output is correct
12 Correct 911 ms 50880 KB Output is correct
13 Correct 411 ms 60424 KB Output is correct
14 Correct 109 ms 28496 KB Output is correct
15 Correct 116 ms 29952 KB Output is correct
16 Correct 2 ms 2804 KB Output is correct
17 Correct 4 ms 2812 KB Output is correct
18 Correct 3 ms 2816 KB Output is correct
19 Correct 2 ms 2684 KB Output is correct
20 Correct 1014 ms 70264 KB Output is correct
21 Correct 1126 ms 60412 KB Output is correct
22 Correct 889 ms 50948 KB Output is correct
23 Correct 127 ms 29872 KB Output is correct
24 Correct 142 ms 21388 KB Output is correct
25 Correct 181 ms 25796 KB Output is correct
26 Correct 157 ms 25876 KB Output is correct
27 Correct 116 ms 28480 KB Output is correct
28 Correct 113 ms 29904 KB Output is correct
29 Correct 2 ms 2676 KB Output is correct
30 Correct 2 ms 2892 KB Output is correct
31 Correct 2 ms 2800 KB Output is correct
32 Correct 3 ms 2804 KB Output is correct
33 Correct 296 ms 37716 KB Output is correct
34 Correct 375 ms 55320 KB Output is correct
35 Correct 434 ms 60404 KB Output is correct
36 Correct 466 ms 75316 KB Output is correct
37 Correct 375 ms 55568 KB Output is correct
38 Correct 397 ms 66152 KB Output is correct
39 Correct 393 ms 55472 KB Output is correct
40 Correct 381 ms 66180 KB Output is correct
41 Correct 351 ms 55500 KB Output is correct
42 Correct 377 ms 66352 KB Output is correct
43 Correct 110 ms 28596 KB Output is correct
44 Correct 111 ms 29936 KB Output is correct
45 Correct 680 ms 28128 KB Output is correct
46 Correct 688 ms 27692 KB Output is correct
47 Correct 528 ms 32952 KB Output is correct
48 Correct 870 ms 54380 KB Output is correct
49 Correct 186 ms 27556 KB Output is correct
50 Correct 184 ms 27576 KB Output is correct
51 Correct 177 ms 27796 KB Output is correct
52 Correct 126 ms 28008 KB Output is correct
53 Correct 123 ms 28048 KB Output is correct
54 Correct 126 ms 28048 KB Output is correct