UVA - 11995 模拟
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#include<iostream> #include<cstdio> #include<algorithm> #include<cstdlib> #include<cstring> #include<string> #include<cmath> #include<map> #include<set> #include<vector> #include<queue> #include<bitset> #include<ctime> #include<deque> #include<stack> #include<functional> #include<sstream> //#include<cctype> //#pragma GCC optimize(2) using namespace std; #define maxn 100005 #define inf 0x7fffffff //#define INF 1e18 #define rdint(x) scanf("%d",&x) #define rdllt(x) scanf("%lld",&x) #define rdult(x) scanf("%lu",&x) #define rdlf(x) scanf("%lf",&x) #define rdstr(x) scanf("%s",x) #define mclr(x,a) memset((x),a,sizeof(x)) typedef long long ll; typedef unsigned long long ull; typedef unsigned int U; #define ms(x) memset((x),0,sizeof(x)) const long long int mod = 1e9; #define Mod 1000000000 #define sq(x) (x)*(x) #define eps 1e-5 typedef pair<int, int> pii; #define pi acos(-1.0) //const int N = 1005; #define REP(i,n) for(int i=0;i<(n);i++) typedef pair<int, int> pii; inline int rd() { int x = 0; char c = getchar(); bool f = false; while (!isdigit(c)) { if (c == ‘-‘) f = true; c = getchar(); } while (isdigit(c)) { x = (x << 1) + (x << 3) + (c ^ 48); c = getchar(); } return f ? -x : x; } ll gcd(ll a, ll b) { return b == 0 ? a : gcd(b, a%b); } int sqr(int x) { return x * x; } /*ll ans; ll exgcd(ll a, ll b, ll &x, ll &y) { if (!b) { x = 1; y = 0; return a; } ans = exgcd(b, a%b, x, y); ll t = x; x = y; y = t - a / b * y; return ans; } */ int n; int main() { // ios::sync_with_stdio(0); while (cin >> n) { stack<int>sk; queue<int>qu; priority_queue<int>q; bool fg1 = 1, fg2 = 1, fg3 = 1; for (int i = 1; i <= n; i++) { int opt; opt = rd(); if (opt == 1) { int x = rd(); if (fg1)sk.push(x); if (fg2)qu.push(x); if (fg3)q.push(x); } else { int x = rd(); if (!sk.empty() && sk.top() == x && fg1)sk.pop(); else fg1 = 0; if (!qu.empty() && qu.front() == x && fg2)qu.pop(); else fg2 = 0; if (!q.empty() && q.top() == x && fg3)q.pop(); else fg3 = 0; } } int ans = fg1 + fg2 + fg3; if (!ans)cout << "impossible" << endl; else { if (ans == 1) { if (fg1 == 1)cout << "stack" << endl; else if (fg2)cout << "queue" << endl; else if (fg3)cout << "priority queue" << endl; } else cout << "not sure" << endl; } } return 0; }
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