Submission #977657

#	Time	Username	Problem	Language	Result	Execution time	Memory
977657		gaga999	Street Lamps (APIO19_street_lamps)	C++17	100 / 100	452 ms	43016 KiB

street_lamps

// #pragma GCC optimize("Ofast,no-stack-protector")
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx,avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
#define lowbit(x) ((x) & -(x))
#define ml(a, b) ((1ll * (a) * (b)) % M)
#define tml(a, b) (a) = ((1ll * (a) * (b)) % M)
#define ad(a, b) ((0ll + (a) + (b)) % M)
#define tad(a, b) (a) = ((0ll + (a) + (b)) % M)
#define mi(a, b) ((0ll + M + (a) - (b)) % M)
#define tmi(a, b) (a) = ((0ll + M + (a) - (b)) % M)
#define tmin(a, b) (a) = min((a), (b))
#define tmax(a, b) (a) = max((a), (b))
#define iter(a) (a).begin(), (a).end()
#define riter(a) (a).rbegin(), (a).rend()
#define init(a, b) memset((a), (b), sizeof(a))
#define cpy(a, b) memcpy((a), (b), sizeof(a))
#define uni(a) a.resize(unique(iter(a)) - a.begin())
#define size(x) (int)x.size()
#define pb emplace_back
#define mpr make_pair
#define ls(i) ((i) << 1)
#define rs(i) ((i) << 1 | 1)
#define INF 0x3f3f3f3f
#define NIF 0xc0c0c0c0
#define eps 1e-9
#define F first
#define S second
#define AC cin.tie(0)->sync_with_stdio(0)
using namespace std;
typedef long long llt;
typedef __int128_t lll;
typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef pair<llt, llt> pll;
typedef pair<llt, int> pli;
typedef complex<double> cd;
// const int M = 998244353;

// random_device rm;
// mt19937 rg(rm());
// default_random_engine rg(rm());
// uniform_int_distribution<int> rd(INT_MIN, INT_MAX);
// uniform_real_distribution<double> rd(0, M_PI);

void db() { cerr << "\n"; }
template <class T, class... U>
void db(T a, U... b) { cerr << a << " ", db(b...); }

inline char gc()
{
    const static int SZ = 1 << 16;
    static char buf[SZ], *p1, *p2;
    if (p1 == p2 && (p2 = buf + fread(p1 = buf, 1, SZ, stdin), p1 == p2))
        return -1;
    return *p1++;
}
void rd() {}
template <typename T, typename... U>
void rd(T &x, U &...y)
{
    x = 0;
    bool f = 0;
    char c = gc();
    while (!isdigit(c))
        f ^= !(c ^ 45), c = gc();
    while (isdigit(c))
        x = (x << 1) + (x << 3) + (c ^ 48), c = gc();
    f && (x = -x), rd(y...);
}

template <typename T>
void prt(T x)
{
    if (x < 0)
        putchar('-'), x = -x;
    if (x > 9)
        prt(x / 10);
    putchar((x % 10) ^ 48);
}
typedef array<int, 4> ar4;
const int N = 3e5 + 15;
char s[N];
set<int> st;
ar4 ar[N << 2];
int ln, an[N], bs[N], n, q;

inline void cg(int p, int v)
{
    for (; p <= q; p += lowbit(p))
        bs[p] += v;
}

inline int qy(int p)
{
    int v = 0;
    for (; p; p -= lowbit(p))
        v += bs[p];
    return v;
}

void slv(int l, int r)
{
    if (l >= r - 1)
        return;
    int m = (l + r + 1) >> 1, p = l;
    slv(l, m), slv(m, r);
    for (int i = m; i < r; i++)
    {
        if (ar[i][2])
            continue;
        while (p < m && ar[p][1] > ar[i][1])
            cg(ar[p][3], ar[p][2]), p++;
        an[ar[i][3]] += qy(ar[i][3]);
    }
    for (int i = l; i < p; i++)
        cg(ar[i][3], -ar[i][2]);
    inplace_merge(ar + l, ar + m, ar + r, [&](const ar4 &a, const ar4 &b)
                  { return a[1] > b[1]; });
}

signed main()
{
    int x, y;
    char op[10];
    scanf("%d%d%s", &n, &q, s + 1);
    for (int i = 1; i <= n; i++)
        if (!(s[i] -= '0'))
            st.insert(i);
    st.insert(0), st.insert(n + 1);
    init(an, -1);
    for (int i = 1; i <= q; i++)
    {
        scanf("%s", op);
        if (op[0] == 't')
        {
            scanf("%d", &x);
            if (s[x])
            {
                auto it = st.insert(x).F;
                int l = *prev(it), r = *next(it);
                ar[ln++] = {l, r, i, i};
                ar[ln++] = {l, x, -i, i};
                ar[ln++] = {x, r, -i, i};
            }
            else
            {
                auto it = st.lower_bound(x);
                int l = *prev(it), r = *next(it);
                ar[ln++] = {l, r, -i, i};
                ar[ln++] = {l, x, i, i};
                ar[ln++] = {x, r, i, i};
                st.erase(it);
            }
            s[x] ^= 1;
        }
        else
        {
            scanf("%d%d", &x, &y), y--;
            an[i] = *st.lower_bound(x) <= y ? 0 : i;
            ar[ln++] = {x, y, 0, i};
        }
    }
    sort(ar, ar + ln, [&](const ar4 &a, const ar4 &b)
         { return a[0] ^ b[0] ? a[0] < b[0] : a[1] < b[1]; });
    slv(0, ln);
    for (int i = 1; i <= q; i++)
        if (~an[i])
            printf("%d\n", an[i]);
}

Compilation message (stderr)

street_lamps.cpp: In function 'int main()':
street_lamps.cpp:126:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  126 |     scanf("%d%d%s", &n, &q, s + 1);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
street_lamps.cpp:134:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  134 |         scanf("%s", op);
      |         ~~~~~^~~~~~~~~~
street_lamps.cpp:137:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  137 |             scanf("%d", &x);
      |             ~~~~~^~~~~~~~~~
street_lamps.cpp:159:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  159 |             scanf("%d%d", &x, &y), y--;
      |             ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20