C. 【二月份 -- 基础语法组】-- T3 --统计

#include <bits/stdc++.h>
using namespace std;
const int SIZE = 2e5 + 5;//=2*10^5+5
int a[SIZE], sum[SIZE];
int main() {
    freopen("statistics.in", "r", stdin);
    freopen("statistics.out", "w", stdout);
    int n, p;
    cin >> n >> p;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        sum[i] = sum[i - 1] + (a[i] != a[i - 1]);
    }
    while (n--) {
        int l;
        int r;
        cin >> l >> r;
        cout << sum[r] - sum[l - 1] + (a[l] == a[l - 1]) << endl;
    }
    return 0;
}