//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// // [Tips] // XCodeでのEOF入力はCtrl+D // ¥はAlt+\ // ansは結構INTの範囲2,147,483,647を超えることがあるのでlong long使っておいたほうが良い //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////// // //////////////////////////////////////// //#define debug //******************************************************************************************************************************************* #ifdef debug #include #endif #include #include // next_permutation #include #include #include #include #include #include //memcpy #include #include #include #include #include //accumulate //#include //#include //hash func. #include //ifstream, ofstream #include //insert_iterator::inserter #include //#define NDEBUG //If NDEBUG is defined before #include , assert will be ignored. You had better define NDEBUG when u submit the code. #include //assert using namespace std; #define dout cout //If u wanna output to a text file instead of standard output, plz define OUTPUTFILE. //#define OUTPUTFILE "output.txt" //************************************************************ #ifdef OUTPUTFILE #define dout outputfile ofstream outputfile(OUTPUTFILE); #define OutputFilePath "/Users/Nag/Documents/Prgm/Test/DerivedData/Test/Build/Products/Debug/output.txt" #endif #define din cin //If u wanna input from a text file instead of standard input, plz define INPUTFROMTEXTFILEを. //#define INPUTFILE "input.txt" //************************************************************** #ifdef INPUTFILE #define din inputfile ifstream inputfile(INPUTFILE); #endif #define scand(A) scanf("%d", &(A)) #define scans(A) scanf("%s", (A)) #define printd(A) printf("%d\n", (A)) #define prints(A) printf("%s\n", (A)) #define disp(A) dout << #A << " = " << setw(3) << (A) << endl #define disP(A) dout << setw(3) << (A) << " " #define rep(i,a,n) for(int (i)=(a); (i)<(n); (i)++) #define show(A,s,g) dout << #A << " = "; rep(j, (s), (g)) {disP(A[j]);} dout << endl #define showi(A,s,g) dout << #A << " = "; rep(j, (s), (g)) {disP(j);} dout << endl #define sign(x) ((x)>0)-((x)<0) //x<0: -1, x=0: 0, x>0: +1 #define p(i) ((i)/2) #define l(i) ((i)*2) #define r(i) ((i)*2+1) #define sibling(i) (i^1) //the other sibling of i (ex. 16^1 = 17, 17^1 = 16) #define isRightChild(i) (i&1) // ex. 16&1 = 0, 17&1 = 1 #define isLeftChild(i) (!(i&1)) // ex. 16&1 = 1, 17&1 = 0 int dx[] = {1, 0, -1, 0}; int dy[] = {0, 1, 0, -1}; typedef pair ii; typedef pair iii; typedef vector vi; typedef long long ll; typedef unsigned long long ull; const int INF = (1LL<<31)-1; const ll INF_LL = (ll)9e18-1LL; //Be careful for overflow. const ull INF_ULL = (ull)1e19-1ULL; const int NONE = -1; //const ll MOD = (ll)1e9+7; //大きい素数の代表といえばこの人、10億7さん const int MOD = 16411; const int N_MAX = 160; //num of vertex or element const int M_MAX = 100010; //num of edge const int DATA_MAX = 1010; int N; int a[N_MAX]; int ans = 0; void init() { } void display() { #ifdef debug dout << "----\n"; show(a,0,N); #endif } int main() { //cin, coutの高速化 *注意:cinを使うなら全部cinで、scanfを使うなら全部scanfで統一するように! cin.tie(0); //cinとcoutの同期を切る ios::sync_with_stdio(false); //iostreamとstdioの同期を切る //read input data // scand(N); din >> N; rep(i,0,N) { din >> a[i]; } init(); display(); //------------------------------------------------------------------------------------------ #ifdef debug //start timer auto startTime = chrono::system_clock::now(); #endif //------------------------------------------------------------------------------------------ int num1 = 0, num2 = 0, num3orMore = 0; rep(i,0,N) { if(a[i]==1) num1++; if(a[i]==2) num2++; if(a[i]>2) num3orMore++; } char winner; if(num3orMore>0 or num2>1 or num1%2==0) winner = 'B'; else winner = 'A'; #ifdef debug dout << "=== OUTPUT ===\n"; #endif dout << winner << endl; //------------------------------------------------------------------------------------------ #ifdef debug //stop timer auto endTime = chrono::system_clock::now(); auto dur = endTime - startTime; auto msec = chrono::duration_cast(dur).count(); dout << fixed << setprecision(4) << (double)msec/1000 << " sec \n"; #endif //------------------------------------------------------------------------------------------ #ifdef INPUTFILE inputfile.close(); #endif #ifdef OUTPUTFILE outputfile.close(); cout << "\"" << OutputFilePath << "\"" << endl; #endif return 0; }