https://codeforces.com/contest/1101/problem/E

題解：思維

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,q; int ans,cnt,flag,temp; char str; int a,b,c,d; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//scanf("%d",&n);//scanf("%d",&t);//while(t--){}char s[10];int x,y;scanf("%d",&n);for (int i=1;i<=n;++i){scanf("%s%d%d",s,&x,&y);if (x>y) swap(x,y);if (s[0]=='+'){a=max(a,x);b=max(b,y);}else{if (a<=x&&b<=y) printf("YES\n");else printf("NO\n");}}//cout << "Hello world!" << endl;return 0; }

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