没人写？那我来咯··

#include <iostream>
#include <vector>
using namespace std;

vector<int> calculateStability(const string& s) {
    vector<int> stability(s.length());
    for (int i = 0; i < s.length(); i++) {
        if (i+1 < s.length() && s[i] == s[i+1]) {
            stability[i] = 1 + (i > 0 ? stability[i-1] : 0);
        } else {
            stability[i] = (i > 0 ? stability[i-1] : 0);
        }
    }
    return stability;
}

int main() {
    string s;
    cin >> s;
    int m;
    cin >> m;
    vector<int> stability = calculateStability(s);
    for (int i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        int result = (a > 1 ? stability[b-2] - stability[a-2] : stability[b-2]);
        cout << result << endl;
    }
    return 0;
}

自己写

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