三、阅读程序

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#include <cstdio>
char st[100];
int main() {
    scanf("%s", st);
    for (int i = 0; st[i]; ++i) {
        if ('A' <= st[i] && st[i] <= 'Z')
            st[i] += 1;
    }
    printf("%s", st);
    return 0;
}

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#include <cstdio>
int main() {
    int x;
    scanf("%d", &x);
    int res = 0;
    for (int i = 0; i < x; ++i) {
        if (i * i % x == 1) {
            ++res;
        }
    }
    printf("%d", res);
    return 0;
}

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#include <iostream>
using namespace std;
int n, m;
int findans(int n, int m) {
    if (n == 0) return m;
    if (m == 0) return n % 3;
    return findans(n - 1, m) - findans(n, m - 1) + findans(n - 1, m - 1);
}
int main(){
    cin >> n >> m;
    cout << findans(n, m) << endl;
    return 0;
}

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#include <cstdio>
int n, d[100];
bool v[100];
int main() {
    scanf("%d", &n);
    for (int i = 0; i < n; ++i) {
        scanf("%d", d + i);
        v[i] = false;
    }
    int cnt = 0;
    for (int i = 0; i < n; ++i) {
        if (!v[i]) {
            for (int j = i; !v[j]; j = d[j]) {
                v[j] = true;
            }
            ++cnt;
        }
    }
    printf("%d", cnt);
    return 0;
}