#include <bits/stdc++.h> using namespace std; #define PII pair<int, int> #define VI vector<int> #define VPII vector<PII> #define LL long long #define LD long double #define f first #define s second #define MP make_pair #define PB push_back #define ALL(c) (c).begin(), (c).end() #define SIZ(c) (int)(c).size() #define REP(i, n) for(int i = 0; i < (int)(n); ++i) #define FOR(i, b, e) for(int i = (b); i <= (int)(e); ++i) #define FORD(i, b, e) for(int i = (b); i >= (int)(e); --i) #define Sim template<class n Sim, class s> ostream & operator << (ostream &p, pair<n, s> x) {return p << "<" << x.st << ", " << x.nd << ">";} Sim> auto operator << (ostream &p, n y) -> typename enable_if<!is_same<n, string>::value, decltype(y.begin(), p)>::type {int o = 0; p << "{"; for(auto c: y) {if(o++) p << ", "; p << c;} return p << "}";} void dor() {cerr << endl;} Sim, class...s> void dor(n p, s...y) {cerr << p << " "; dor(y...);} Sim, class s> void mini(n &p, s y) {if(p>y) p = y;} Sim, class s> void maxi(n &p, s y) {if(p<y) p = y;} #ifdef DEB #define debug(...) dor(__FUNCTION__, ":", __LINE__, ": ", __VA_ARGS__) #else #define debug(...) #endif #define I(x) #x " = ", (x), " " #define A(a, i) #a "[" #i " = ", i, "] = ", a[i], " " int main() { int n; scanf("%d", &n); int ones = 0; FOR(i, 1, n) { int a; scanf("%d", &a); if(a == 1) ones++; } printf("%d\n", 2 - min(2, ones)); printf("2\n"); printf("1 2\n"); }
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 | #include <bits/stdc++.h> using namespace std; #define PII pair<int, int> #define VI vector<int> #define VPII vector<PII> #define LL long long #define LD long double #define f first #define s second #define MP make_pair #define PB push_back #define ALL(c) (c).begin(), (c).end() #define SIZ(c) (int)(c).size() #define REP(i, n) for(int i = 0; i < (int)(n); ++i) #define FOR(i, b, e) for(int i = (b); i <= (int)(e); ++i) #define FORD(i, b, e) for(int i = (b); i >= (int)(e); --i) #define Sim template<class n Sim, class s> ostream & operator << (ostream &p, pair<n, s> x) {return p << "<" << x.st << ", " << x.nd << ">";} Sim> auto operator << (ostream &p, n y) -> typename enable_if<!is_same<n, string>::value, decltype(y.begin(), p)>::type {int o = 0; p << "{"; for(auto c: y) {if(o++) p << ", "; p << c;} return p << "}";} void dor() {cerr << endl;} Sim, class...s> void dor(n p, s...y) {cerr << p << " "; dor(y...);} Sim, class s> void mini(n &p, s y) {if(p>y) p = y;} Sim, class s> void maxi(n &p, s y) {if(p<y) p = y;} #ifdef DEB #define debug(...) dor(__FUNCTION__, ":", __LINE__, ": ", __VA_ARGS__) #else #define debug(...) #endif #define I(x) #x " = ", (x), " " #define A(a, i) #a "[" #i " = ", i, "] = ", a[i], " " int main() { int n; scanf("%d", &n); int ones = 0; FOR(i, 1, n) { int a; scanf("%d", &a); if(a == 1) ones++; } printf("%d\n", 2 - min(2, ones)); printf("2\n"); printf("1 2\n"); } |