oj.uz

Submission #950543

# Submission time Handle Problem Language Result Execution time Memory
950543 2024-03-20T12:08:53 Z peterandvoi Modern Machine (JOI23_ho_t5) C++17
15 / 100
 574 ms 452200 KB 
#include <bits/stdc++.h>

using namespace std;

#ifdef ngu
#include "debug.h"
#else
#define debug(...) 42
#endif

const int N = 120005;

int n, m, q;
char c[N];
int a[N];

struct from_to {
    int l, L, len;

    from_to(): l(0), L(0), len(0) {};

    from_to(int l, int L, int len): l(l), L(L), len(len) {};

    int r() const {
        return l + len - 1;
    }

    bool operator < (const from_to &oth) const {
        return l < oth.l;
    }
};

int add(int a, int b) {
    a += b;
    while (a >= n + 1) {
        a -= n + 1;
    }
    return a;
}

vector<from_to> tree[N << 2];

vector<from_to> cmb(const vector<from_to> &a, const vector<from_to> &b) {
    vector<from_to> res;
    for (auto [bl, al, len] : a) {
        int ar = add(al, len - 1);
        int br = add(bl, len - 1);
        int L = lower_bound(b.begin(), b.end(), from_to(al + 1, 0, 0)) - b.begin() - 1;
        int R = lower_bound(b.begin(), b.end(), from_to(ar + 1, 0, 0)) - b.begin() - 1;
        R += al > ar ? (int) b.size() : 0;
        for (int i = L; i <= R; ++i) {
            int j = i % (int) b.size();
            int delta = max(b[j].l, al) - b[j].l;
            int len = min(br - bl + 1, b[j].r() - max(b[j].l, al) + 1);
            int tl = add(b[j].L, delta);
            res.emplace_back(bl, tl, len);
            bl += len;
            al = add(al, len);
        }
    }
    return res;
}

void bld(int id, int l, int r) {
    if (l == r) {
        tree[id].emplace_back(0, add(0, a[l] + 1), a[l]);
        tree[id].emplace_back(a[l], add(a[l], a[l]), n - a[l] + 1);
    } else {
        int mid = l + r >> 1;
        bld(id << 1, l, mid);
        bld(id << 1 | 1, mid + 1, r);
        tree[id] = cmb(tree[id << 1], tree[id << 1 | 1]);
    }
}

int get(const vector<from_to> &a, int p) {
    int pos = lower_bound(a.begin(), a.end(), from_to(p + 1, 0, 0)) - a.begin() - 1;
    return add(a[pos].L, p - a[pos].l);
}

int qry(int u, int v, int p, int id = 1, int l = 1, int r = m) {
    if (u <= l && r <= v) {
        return get(tree[id], p);
    }
    int mid = l + r >> 1;
    if (u <= mid && mid < v) {
        return qry(u, v, qry(u, v, p, id << 1, l, mid), id << 1 | 1, mid + 1, r);
    }
    if (mid < u) {
        return qry(u, v, p, id << 1 | 1, mid + 1, r);
    }
    return qry(u, v, p, id << 1, l, mid);
}

const int LOG = 18;

int numB, numR;
int cnt_red[N];
int MASK[LOG];
int red[N], blue[N];
int jump[LOG][LOG][N];
int pushB[LOG][N], pushR[LOG][N];

int get(int l, int r, int pref[N]) {
    return pref[r] - pref[l - 1];
}

bool ck(int l, int r, int pos) {
    return red[r] <= pos || (blue[l] < pos && c[pos] == 'B');
}

int get_red(int l, int r, int pos) {
    int cnt = blue[l] + get(blue[l], red[r] - 1, cnt_red);
    if (pos != -1) {
        cnt = add(cnt, pos + ck(l, r, pos));
    }
    return cnt;
}

int qry(int l, int r) {
    int iter = LOG - 2;
    int L = 0, R = 0, x = 0, y = 0;
    while (iter--) {
        int nxt = min(r + 1, jump[x][y][l]);
        if (l < nxt) {
            auto check = [&](int mid) {
                int tL = min(numB + 1, L + get(l, mid, pushB[x]));
                int tR = min(numR + 1, R + get(l, mid, pushR[y]));
                return blue[tL] < red[tR];
            };
            if (check(nxt - 1)) {
                L += get(l, nxt - 1, pushB[x]);
                R += get(l, nxt - 1, pushR[y]);
                l = nxt;
            } else {
                int tl = l, tr = nxt - 2, p = nxt - 2;
                while (tl <= tr) {
                    int mid = tl + tr >> 1;
                    if (check(mid)) {
                        p = mid;
                        tl = mid + 1;
                    } else {
                        tr = mid - 1;
                    }
                }
                L += get(l, p, pushB[x]);
                R += get(l, p, pushR[y]);
                int cnt = get_red(L, R, a[p + 1]);
                return p + 2 > r ? cnt : qry(p + 2, r, cnt);
            }
        }
        int num_red = get_red(L, R, -1);
        if (l == r + 1) {
            return num_red;
        }
        bool spec = ck(L, R, a[l]);
        int tl = L, tr = R;
        if (a[l] <= n - num_red) {
            tl = min(numB + 1, L + a[l] + spec);
        } else {
            tr = min(numR + 1, R + n - a[l] + !spec);
        }
        if (blue[tl] + 1 >= red[tr]) {
            int cnt = get_red(L, R, a[l]);
            return l + 1 > r ? cnt : qry(l + 1, r, cnt);
        }
        L = tl;
        R = tr;
        l++;
        while (x + 1 < LOG && MASK[x + 1] < blue[L]) {
            x++;
        }
        while (y + 1 < LOG && red[R] <= n - MASK[y + 1]) {
            y++;
        }
    }
    assert(0);
    return -1;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    #ifdef ngu
    freopen("test.inp", "r", stdin);
    freopen("test.out", "w", stdout);
    #endif
    cin >> n >> m;
    for (int i = 1; i < LOG; ++i) {
        MASK[i] = 1 << (i - 1);
    }
    for (int i = 1; i <= n; ++i) {
        cin >> c[i];
        cnt_red[i] = cnt_red[i - 1] + (c[i] == 'R');
        if (c[i] == 'B') {
            blue[++numB] = i;
        }
    }
    cnt_red[n + 1] = cnt_red[n];
    blue[numB + 1] = n + 1;
    red[0] = n + 1;
    for (int i = n; i >= 1; --i) {
        if (c[i] == 'R') {
            red[++numR] = i;
        }
    }
    for (int i = 1; i <= m; ++i) {
        cin >> a[i];
    }
    bld(1, 1, m);
    cin >> q;
    for (int i = 0; i < LOG; ++i) {
        for (int j = 0; j < LOG; ++j) {
            jump[i][j][m + 1] = m + 1;;
            for (int k = m; k >= 1; --k) {
                bool edge_case = a[k] == n && c[n] == 'B';
                jump[i][j][k] = MASK[i] < a[k] && a[k] <= n - MASK[j] && !edge_case ? k : jump[i][j][k + 1];
            }
        }
    }
    for (int i = 0; i < LOG; ++i) {
        for (int j = 1; j <= m; ++j) {
            pushB[i][j] = pushB[i][j - 1];
            pushR[i][j] = pushR[i][j - 1];
            if (a[j] <= MASK[i]) {
                pushB[i][j] += a[j];
            }
            if (n - MASK[i] < a[j]) {
                pushR[i][j] += n - a[j];
            }
        }
    }
    while (q--) {
        int l, r;
        cin >> l >> r;
        cout << qry(l, r) << "\n";
    }
}

Compilation message

Main.cpp: In function 'void bld(int, int, int)':
Main.cpp:69:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   69 |         int mid = l + r >> 1;
      |                   ~~^~~
Main.cpp: In function 'int qry(int, int, int, int, int, int)':
Main.cpp:85:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   85 |     int mid = l + r >> 1;
      |               ~~^~~
Main.cpp: In function 'int qry(int, int)':
Main.cpp:138:34: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  138 |                     int mid = tl + tr >> 1;
      |                               ~~~^~~~

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 165740 KB Output is correct
2 Correct 19 ms 165780 KB Output is correct
3 Correct 20 ms 165980 KB Output is correct
4 Correct 20 ms 165724 KB Output is correct
5 Correct 19 ms 165716 KB Output is correct
6 Correct 19 ms 165708 KB Output is correct
7 Correct 19 ms 165932 KB Output is correct
8 Correct 19 ms 165724 KB Output is correct
9 Correct 19 ms 165608 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 165740 KB Output is correct
2 Correct 19 ms 165780 KB Output is correct
3 Correct 20 ms 165980 KB Output is correct
4 Correct 20 ms 165724 KB Output is correct
5 Correct 19 ms 165716 KB Output is correct
6 Correct 19 ms 165708 KB Output is correct
7 Correct 19 ms 165932 KB Output is correct
8 Correct 19 ms 165724 KB Output is correct
9 Correct 19 ms 165608 KB Output is correct
10 Correct 32 ms 168200 KB Output is correct
11 Correct 35 ms 169044 KB Output is correct
12 Correct 35 ms 169304 KB Output is correct
13 Correct 24 ms 167516 KB Output is correct
14 Correct 29 ms 169044 KB Output is correct

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 165740 KB Output is correct
2 Correct 19 ms 165780 KB Output is correct
3 Correct 20 ms 165980 KB Output is correct
4 Correct 20 ms 165724 KB Output is correct
5 Correct 19 ms 165716 KB Output is correct
6 Correct 19 ms 165708 KB Output is correct
7 Correct 19 ms 165932 KB Output is correct
8 Correct 19 ms 165724 KB Output is correct
9 Correct 19 ms 165608 KB Output is correct
10 Correct 32 ms 168200 KB Output is correct
11 Correct 35 ms 169044 KB Output is correct
12 Correct 35 ms 169304 KB Output is correct
13 Correct 24 ms 167516 KB Output is correct
14 Correct 29 ms 169044 KB Output is correct
15 Correct 19 ms 165720 KB Output is correct
16 Correct 19 ms 165724 KB Output is correct
17 Correct 20 ms 165724 KB Output is correct
18 Correct 324 ms 208764 KB Output is correct
19 Correct 340 ms 219916 KB Output is correct
20 Correct 374 ms 236976 KB Output is correct
21 Correct 333 ms 237400 KB Output is correct
22 Correct 370 ms 230156 KB Output is correct
23 Runtime error 574 ms 452200 KB Execution killed with signal 6
24 Halted 0 ms 0 KB -

Subtask #4
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 165932 KB Output is correct
2 Correct 311 ms 201200 KB Output is correct
3 Correct 341 ms 201040 KB Output is correct
4 Runtime error 308 ms 385872 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 165932 KB Output is correct
2 Correct 311 ms 201200 KB Output is correct
3 Correct 341 ms 201040 KB Output is correct
4 Runtime error 308 ms 385872 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 165932 KB Output is correct
2 Correct 311 ms 201200 KB Output is correct
3 Correct 341 ms 201040 KB Output is correct
4 Runtime error 308 ms 385872 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #7
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 165740 KB Output is correct
2 Correct 19 ms 165780 KB Output is correct
3 Correct 20 ms 165980 KB Output is correct
4 Correct 20 ms 165724 KB Output is correct
5 Correct 19 ms 165716 KB Output is correct
6 Correct 19 ms 165708 KB Output is correct
7 Correct 19 ms 165932 KB Output is correct
8 Correct 19 ms 165724 KB Output is correct
9 Correct 19 ms 165608 KB Output is correct
10 Correct 32 ms 168200 KB Output is correct
11 Correct 35 ms 169044 KB Output is correct
12 Correct 35 ms 169304 KB Output is correct
13 Correct 24 ms 167516 KB Output is correct
14 Correct 29 ms 169044 KB Output is correct
15 Correct 19 ms 165720 KB Output is correct
16 Correct 19 ms 165724 KB Output is correct
17 Correct 20 ms 165724 KB Output is correct
18 Correct 324 ms 208764 KB Output is correct
19 Correct 340 ms 219916 KB Output is correct
20 Correct 374 ms 236976 KB Output is correct
21 Correct 333 ms 237400 KB Output is correct
22 Correct 370 ms 230156 KB Output is correct
23 Runtime error 574 ms 452200 KB Execution killed with signal 6
24 Halted 0 ms 0 KB -