牛客OI周赛6-提高组 B 践踏

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代码：

#include<cstdio>
#include<algorithm>
#include<cstring>
#include<iostream>
#include<cmath>
#include<cctype>
#include<set>
#include<queue>
#include<vector>
#include<map>
using namespace std;
typedef long long LL;

inline int read() {
    int x=0,f=1;char ch=getchar();for(;!isdigit(ch);ch=getchar())if(ch=='-')f=-1;
    for(;isdigit(ch);ch=getchar())x=x*10+ch-'0';return x*f;
}

const int N = 500005;

int disc[N];
struct OPT{ int opt, l, r; } A[N];
struct Bit{
    int sum[N], n;
    void update(int p,int v) { p ++;
        for (; p <= n; p += (p & (-p))) sum[p] += v;
    }
    int query(int p) { p ++;
        int ans = 0;
        for (; p; p -= (p & (-p))) ans += sum[p];
        return ans;
    }
}bit;

void solve1(int n,int k) {
    bit.n = n + 2; int now = 0;
    for (int i = 1; i <= n; ++i) {
        int opt = read(), l = read(), r, v;
        if (opt == 3) { printf("%d\n", bit.query(l % k) + now); continue; }
        r = read();
        v = opt == 1 ? 1 : -1;
        if (r - l + 1 >= k) { now += v; continue; }
        l %= k, r %= k;
        if (l <= r) bit.update(l, v), bit.update(r + 1, -v);
        else bit.update(0, v), bit.update(r + 1, -v), bit.update(l, v), bit.update(k, -v);
    }
}

void solve0(int n) {
    int tot = 0, cnt = 1;
    for (int i = 1; i <= n; ++i) {
        A[i].opt = read(), A[i].l = read(); A[i].r = -1;
        disc[++tot] = A[i].l;
        if (A[i].opt <= 2) A[i].r = read(), disc[++tot] = A[i].r;
    }
    sort(disc + 1, disc + tot + 1);
    for (int i = 2; i <= tot; ++i) if (disc[i] != disc[cnt]) disc[++cnt] = disc[i];
    bit.n = cnt + 2;
    for (int i = 1; i <= n; ++i) {
        A[i].l = lower_bound(disc + 1, disc + cnt + 1, A[i].l) - disc;
        if (A[i].r != -1) A[i].r = lower_bound(disc + 1, disc + cnt + 1, A[i].r) - disc;
        if (A[i].opt == 1) bit.update(A[i].l, 1), bit.update(A[i].r + 1, -1);
        else if (A[i].opt == 2) bit.update(A[i].l, -1), bit.update(A[i].r + 1, 1);
        else printf("%d\n", bit.query(A[i].l));
    }
}

int main() {
    int n = read(), k = read();
    if (!n && !k) { cout << "fafa"; return 0; }
    if (k == 0) solve0(n);
    else solve1(n, k);
    return 0;
}