Submission #890786

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Source Code Expand

#include <bits/stdc++.h>
#define sz(x) (int((x).size()))
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
template<typename T> bool domax(T &a, T b) { return (b > a ? (a = b, true) : false); }
template<typename T> bool domin(T &a, T b) { return (b < a ? (a = b, true) : false); }
typedef long long ll;

int n, a[100*1000+5], ans;
int main() {
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) scanf("%d", a+i);
    for (int i = 1; i <= n; i++) if (a[a[i]] == i) ans++;
    printf("%d\n", ans/2);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:12:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
./Main.cpp:13:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 1; i <= n; i++) scanf("%d", a+i);
                                                  ^

Judge Result