#include <bits/stdc++.h> using namespace std; typedef long long LL; typedef long double LD; typedef pair < int, int > PII; typedef pair < LL, LL > PLL; typedef pair < LD, LD > PDD; #define _upgrade ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); #define all(x) (x).begin(), (x).end() #define sz(x) (int)(x).size() template < typename _T > inline void _DBG(const char *s, _T x) { cerr << s << " = " << x << "\n"; } template < typename _T, typename... args > void _DBG(const char *s, _T x, args... a) { while(*s != ',') cerr << *s++; cerr << " = " << x << ','; _DBG(s + 1, a...); } #ifdef LOCAL #define DBG(...) _DBG(#__VA_ARGS__, __VA_ARGS__) #define __gcd gcd #else #define DBG(...) (__VA_ARGS__) #define cerr if(0) cout #endif // ********************** CODE ********************** // int n, leaves = 0; int main() { _upgrade cin >> n; for(int i = 1; i <= n; i++) { int x; cin >> x; if(x == 1) leaves++; } if(leaves >= 2) { cout << 0 << "\n"; cout << 2 << "\n"; cout << "1 2" << "\n"; } else if(leaves == 1) { cout << 1 << "\n"; cout << 2 << "\n"; cout << "1 2" << "\n"; } else { cout << 2 << "\n"; cout << 2 << "\n"; cout << "1 2" << "\n"; } return 0; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | #include <bits/stdc++.h> using namespace std; typedef long long LL; typedef long double LD; typedef pair < int, int > PII; typedef pair < LL, LL > PLL; typedef pair < LD, LD > PDD; #define _upgrade ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); #define all(x) (x).begin(), (x).end() #define sz(x) (int)(x).size() template < typename _T > inline void _DBG(const char *s, _T x) { cerr << s << " = " << x << "\n"; } template < typename _T, typename... args > void _DBG(const char *s, _T x, args... a) { while(*s != ',') cerr << *s++; cerr << " = " << x << ','; _DBG(s + 1, a...); } #ifdef LOCAL #define DBG(...) _DBG(#__VA_ARGS__, __VA_ARGS__) #define __gcd gcd #else #define DBG(...) (__VA_ARGS__) #define cerr if(0) cout #endif // ********************** CODE ********************** // int n, leaves = 0; int main() { _upgrade cin >> n; for(int i = 1; i <= n; i++) { int x; cin >> x; if(x == 1) leaves++; } if(leaves >= 2) { cout << 0 << "\n"; cout << 2 << "\n"; cout << "1 2" << "\n"; } else if(leaves == 1) { cout << 1 << "\n"; cout << 2 << "\n"; cout << "1 2" << "\n"; } else { cout << 2 << "\n"; cout << 2 << "\n"; cout << "1 2" << "\n"; } return 0; } |