codeforces 233A
2012-12-31 20:58
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简单的数学题
就是
f1= 2
f2= 1
f3= 4
f4= 3
f5 = 6
f6 = 5 ....
就是
f1= 2
f2= 1
f3= 4
f4= 3
f5 = 6
f6 = 5 ....
#include <iostream> using namespace std; int main ( ) { int n; cin >> n; if ( n % 2 ) { cout << "-1" << endl; } else { for ( int i = 2; i <= n; i += 2 ) cout << i << " " << i - 1 << " "; cout << endl; } }
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