[Luogu] 贪婪大陆

https://www.luogu.org/problemnew/show/P2184

区间修改时只需修改区间端点的numl或numr值
区间查询x-y只需用1-y的numr - 1-(x - 1)的numl值
线段树 单点修改 + 区间查询

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cmath>

using namespace std;
const int N = 1e5 + ;

#define yxy getchar()
#define lson jd << 1
#define rson jd << 1 | 1

#define RR freopen("gg.in", "r", stdin)

int n, Ty, Ans, Ans1, Ans2;
int Numl[N << ], Numr[N << ];

inline int read() {
    int x = ; char c = yxy;
    while(c < '' || c > '') c = yxy;
    while(c >= '' && c <= '') x = x *  + c - '', c = yxy;
    return x;
} 

void Poi_G(int l, int r, int jd, int x, int how) {
    if(l == r) {
        if(!how) Numl[jd] ++;
        else Numr[jd] ++;
        return ;
    }
    int mid = (l + r) >> ;
    if(x <= mid) Poi_G(l, mid, lson, x, how);
    else Poi_G(mid + , r, rson, x, how);
    Numl[jd] = Numl[lson] + Numl[rson];
    Numr[jd] = Numr[lson] + Numr[rson];
}

void Sec_A(int l, int r, int jd, int x, int y, int how) {
    if(x <= l && r <= y) {
        if(!how) Ans += Numl[jd];
        else Ans += Numr[jd];
        return ;
    }
    int mid = (l + r) >> ;
    if(x <= mid) Sec_A(l, mid, lson, x, y, how);
    if(y > mid)  Sec_A(mid + , r, rson, x, y, how);
} 

int main() {
    n = read();
    Ty = read();
    while(Ty --) {
        int opt = read(), x = read(), y = read();
        if(opt == ) {
            Poi_G(, n, , x, );
            Poi_G(, n, , y, );
        } else {
            Ans = ;
            Sec_A(, n, , , y, ); Ans1 = Ans; Ans = ;
            Sec_A(, n, , , x - , ); Ans2 = Ans;
            cout << Ans1 - Ans2 << "\n";
        }
    }
    return ;
}