Submission #552257

#TimeUsernameProblemLanguageResultExecution timeMemory
552257farhan132Building 4 (JOI20_building4)C++17
0 / 100
17 ms31700 KiB
/***Farhan132***/ //#pragma GCC optimize("Ofast") //#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma") //#pragma GCC optimization ("unroll-loops") //#pragma GCC optimize("Ofast,fast-math") #include <bits/stdc++.h> using namespace std; typedef long long ll; typedef unsigned long long ull; typedef double dd; typedef vector<ll> vll; typedef pair<ll , ll> ii; typedef vector< ii > vii; typedef pair < pair < ll , ll > , pair < ll , ll > > cm; typedef tuple < ll, ll, ll > tp; #define ff first #define ss second #define pb push_back #define in insert #define f0(b) for(int i=0;i<(b);i++) #define f00(b) for(int j=0;j<(b);j++) #define f1(b) for(int i=1;i<=(b);i++) #define f11(b) for(int j=1;j<=(b);j++) #define f2(a,b) for(int i=(a);i<=(b);i++) #define f22(a,b) for(int j=(a);j<=(b);j++) #define sf(a) scanf("%lld",&a) #define sff(a,b) scanf("%lld %lld", &a , &b) #define pf(a) printf("%lld\n",a) #define pff(a,b) printf("%lld %lld\n", a , b) #define bug printf("**!\n") #define mem(a , b) memset(a, b ,sizeof(a)) #define front_zero(n) __builtin_clzll(n) #define back_zero(n) __builtin_ctzll(n) #define total_one(n) __builtin_popcount(n) #define clean fflush(stdout) //const ll mod = (ll) 998244353; const ll mod = (ll) 1e9 + 7; const ll maxn = (ll)1e8 + 5; const int nnn = 1048590; const int inf = numeric_limits<int>::max()-1; //const ll INF = numeric_limits<ll>::max()-1; const ll INF = (ll)1e18; ll dx[]={0,1,0,-1}; ll dy[]={1,0,-1,0}; ll dxx[]={0,1,0,-1,1,1,-1,-1}; ll dyy[]={1,0,-1,0,1,-1,1,-1}; bool USACO = 0; mt19937 rng(chrono::system_clock::now().time_since_epoch().count()); #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> using namespace __gnu_pbds; template <typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; const ll N = 1e6 + 5; ll dp_mx[N][2] , dp_mn[N][2]; ll a[N] , b[N]; void solve(){ ll n; cin >> n; for(ll i = 1; i <= 2*n; i++) cin >> a[i]; for(ll i = 1; i <= 2*n; i++) cin >> b[i]; for(ll i = 2; i <= 2*n; i++){ if(min(a[i - 1], b[i - 1]) > max(a[i], b[i])){ cout << "-1\n"; return; } } mem(dp_mn, 0); mem(dp_mx, 0); b[2*n + 1] = a[2*n + 1] = INF; for(ll i = 2*n; i >= 1; i--){ dp_mn[i][0] = dp_mn[i][1] = INF; dp_mx[i][0] = dp_mx[i][1] = -INF; if(a[i] <= a[i + 1]){ dp_mn[i][0] = min(dp_mn[i][0], dp_mn[i + 1][0] + 1); dp_mx[i][0] = max(dp_mx[i][0], dp_mx[i + 1][0] + 1); } if(a[i] <= b[i + 1]){ dp_mn[i][0] = min(dp_mn[i][0], dp_mn[i + 1][1] + 1); dp_mx[i][0] = max(dp_mx[i][0], dp_mx[i + 1][1] + 1); } if(b[i] <= a[i + 1]){ dp_mn[i][1] = min(dp_mn[i][1], dp_mn[i + 1][0]); dp_mx[i][1] = max(dp_mx[i][1], dp_mx[i + 1][0]); } if(b[i] <= b[i + 1]){ dp_mn[i][1] = min(dp_mn[i][1], dp_mn[i + 1][1]); dp_mx[i][1] = max(dp_mx[i][1], dp_mx[i + 1][1]); } } ll need = n; if( !(min(dp_mn[1][0], dp_mn[1][1]) <= n && n <= max(dp_mx[1][0], dp_mx[1][1]) ) ){ cout << "-1\n"; return; } for(ll i = 1; i <= 2*n; i++){ if( (dp_mn[i][1] <= need && need <= dp_mx[i][1]) ){ cout << "B"; }else{ cout << "A"; need--; } } return; } int main() { #ifdef LOCAL freopen("in", "r", stdin); freopen("out", "w", stdout); auto start_time = clock(); #else ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL); #endif //pre(N); ll T = 1, CT = 0; //cin >> T; while(T--){ solve(); } #ifdef LOCAL auto end_time = clock(); cerr<< "Execution time: "<<(end_time - start_time)*(int)1e3/CLOCKS_PER_SEC<<" ms\n"; #endif return 0; }

Compilation message (stderr)

building4.cpp: In function 'int main()':
building4.cpp:141:15: warning: unused variable 'CT' [-Wunused-variable]
  141 |     ll T = 1, CT = 0;  //cin >> T;
      |               ^~
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