Submission #43482086

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
 
//#define int long long
#define rep(i, a, b) for(int i = a; i <= b; ++i)
#define per(i, a, b) for(int i = a; i >= b; --i)
const int maxn = 1e5 + 5;
int n, diff, sa, sb;
int a[maxn], b[maxn], A[maxn], B[maxn];
map<int, int> val; int tot;
int fa[maxn], N;
 
inline bool exist(int x){ return val.find(x) == val.end();}
inline int fnd(int x){ return fa[x] == x ? x : fa[x] = fnd(fa[x]);}
inline void merge(int x, int y){ 
    x = fnd(x), y = fnd(y);
    if(x != y) fa[x] = y, N -= 1;
}
 
signed main(){
    scanf("%d", &n); rep(i, 1, n) fa[i] = i;
    rep(i, 1, n) scanf("%d", &A[i]), 
        a[i] = A[i], sa ^= a[i];
    rep(i, 1, n) scanf("%d", &B[i]), 
        b[i] = B[i], sb ^= b[i];
    a[n + 1] = sa, b[n + 1] = sb; 
    sort(a + 1, a + n + 2), sort(b + 1, b + n + 2);
     
    rep(i, 1, n) if(a[i] != b[i]) return printf("-1"), 0;
    rep(i, 1, n) if(A[i] != B[i]) diff += 1;
    if(!diff) return printf("0"), 0;
     
    rep(i, 1, n) if(A[i] != B[i] and exist(A[i]))
        val[A[i]] = ++tot;
    if(exist(sa)) val[sa] = ++tot; N = tot;
    rep(i, 1, n) if(A[i] != B[i]) merge(val[A[i]], val[B[i]]);
    printf("%d", diff + N - 1);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:35:5: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
   35 |     if(exist(sa)) val[sa] = ++tot; N = tot;
      |     ^~
./Main.cpp:35:36: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’
   35 |     if(exist(sa)) val[sa] = ++tot; N = tot;
      |                                    ^
./Main.cpp:21:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   21 |     scanf("%d", &n); rep(i, 1, n) fa[i] = i;
      |     ~~~~~^~~~~~~~~~
./Main.cpp:22:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   22 |     rep(i, 1, n) scanf("%d", &A[i]),
      |                  ~~~~~^~~~~~~~~~~~~
./Main.cpp:24:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   24 |     rep(i, 1, n) scanf("%d", &B[i]),
      |                  ~~~~~^~~~~~~~~~~~~

Judge Result