#include <bits/stdc++.h> using namespace std; typedef vector<int> VI; typedef pair <int,int> ii; typedef pair <ii,int> iii; typedef long long LL; #define pb push_back const int INF = 2147483647; int n, a, l; int main() { scanf("%d", &n); l = 0; while (n--) { scanf("%d", &a); if (a == 1) l++; } l = min(l, 2); printf("%d\n2\n1 2\n", 2 - l); return 0; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #include <bits/stdc++.h> using namespace std; typedef vector<int> VI; typedef pair <int,int> ii; typedef pair <ii,int> iii; typedef long long LL; #define pb push_back const int INF = 2147483647; int n, a, l; int main() { scanf("%d", &n); l = 0; while (n--) { scanf("%d", &a); if (a == 1) l++; } l = min(l, 2); printf("%d\n2\n1 2\n", 2 - l); return 0; } |