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Submission #1005131

# Submission time Handle Problem Language Result Execution time Memory
1005131 2024-06-22T07:41:32 Z vjudge1 Street Lamps (APIO19_street_lamps) C++17
40 / 100
 463 ms 25108 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 3e5 + 10;
int n, q, store[N], at[N], seg[N];
string s;
pair<int, int> last[N];

void modify(int p, int x, int v = 1, int s = 0, int e = n){
    if (e - s == 1){
        seg[v] = x;
        return;
    }

    int mid = (s + e) / 2, lc = 2 * v, rc = lc + 1;

    if (p < mid) modify(p, x, lc, s, mid);
    else modify(p, x, rc, mid, e);

    seg[v] = max(seg[lc], seg[rc]);
}

int get(int l, int r, int v = 1, int s = 0, int e = n){
    if (r <= s || e <= l) return 0;
    if (l <= s && e <= r) return seg[v];

    int mid = (s + e) / 2, lc = 2 * v, rc = lc + 1;

    return max(get(l, r, lc, s, mid), get(l, r, rc, mid, e));
}

int main(){
    cin >> n >> q >> s;

    if (n <= 100 and q <= 100){
        vector<string> vec;
        vec.push_back(s);
        for (int i = 0; i < q; i ++){
            string qx;
            cin >> qx;

            if (qx[0] == 't'){
                int x;
                cin >> x;
                x--;
                s[x] = '1' - s[x] + '0';
            }
            else{
                int a, b;
                cin >> a >> b;
                a--, b--;

                int ans = 0;
                for (string x : vec){
                    bool good = 1;
                    for (int i = a; i < b; i ++)
                        if (x[i] == '0')
                            good = 0;
                    ans += good;
                }

                cout << ans << endl;
            }
            vec.push_back(s);    
        }
        return 0;
    }

    bool subtask2 = 1;
    vector<pair<string, pair<int, int>>> query;
    for (int i = 0; i < q; i ++){
        string qx;
        int x, y;
        cin >> qx >> x;
        if (qx[0] == 'q')
            cin >> y; 
        query.push_back({qx, {x, y}});

        if (qx[0] == 'q' and (y - x) > 1)
            subtask2 = 0;
    }

    if (subtask2){
        for (int i = 0; i < n; i ++)
            if (s[i] == '1')
                last[i] = {0, -1};

        int tme = 0;
        for (int i = 0; i < q; i ++){
            string qx = query[i].first;

            if (qx[0] == 't'){
                int x;
                x = query[i].second.first;
                x--;
                
                if (s[x] == '1'){
                    last[x].second = tme;
                    s[x] = '0';
                    store[x] += last[x].second - last[x].first + 1;
                }
                else{
                    last[x] = {tme + 1, -1};
                    s[x] = '1';
                }
            }
            else{
                int a = query[i].second.first, b = query[i].second.second;
                a--, b--;

                int val = 0;
                if (last[a].second == -1 and last[a].first != -1)
                    val = tme - last[a].first + 1;

                // cout << a << " : " << last[a].first << " " << last[a].second << ", cur time = " << tme << endl;

                cout << store[a] + val << endl;
            }
            tme++;
        }
        return 0;
    }

    for (int i = 0; i < n; i ++){
        if (s[i] == '0')
            at[i] = n + q + 10;
        else
            at[i] = 0;

        modify(i, at[i]);
    }

    int tme = 0;
    for (int i = 0; i < q; i ++){
        string qx = query[i].first;

        if (qx[0] == 't'){
            int x = query[i].second.first;
            x--;
            at[x] = tme + 1;
            modify(x, tme + 1);
        }
        else{
            int a = query[i].second.first;
            int b = query[i].second.second;
            a--, b--;

            int mx = get(a, b);
            cout << max(0, tme - mx) << endl;
        }
        tme++;
    }
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 246 ms 23728 KB Output is correct
2 Correct 254 ms 23728 KB Output is correct
3 Correct 253 ms 23708 KB Output is correct
4 Correct 294 ms 24916 KB Output is correct
5 Correct 301 ms 24540 KB Output is correct
6 Correct 231 ms 25108 KB Output is correct
7 Correct 414 ms 23824 KB Output is correct
8 Correct 463 ms 25040 KB Output is correct

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Incorrect 1 ms 2396 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 246 ms 23728 KB Output is correct
9 Correct 254 ms 23728 KB Output is correct
10 Correct 253 ms 23708 KB Output is correct
11 Correct 294 ms 24916 KB Output is correct
12 Correct 301 ms 24540 KB Output is correct
13 Correct 231 ms 25108 KB Output is correct
14 Correct 414 ms 23824 KB Output is correct
15 Correct 463 ms 25040 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Incorrect 1 ms 2396 KB Output isn't correct
18 Halted 0 ms 0 KB -