stl的iterator指针的使用

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#include<cstdio> #include<iostream> #include<algorithm> #include<vector> #define FOR(i,s,t) for(register int i=s;i<=t;++i) using namespace std; class node{     public:         int x;         int y;         inline bool operator<(node A)const{             return x<A.x||x==A.x&&y<A.y;         }         inline bool operator>(node A)const{             return x>A.x||x==A.x&&y>A.y;         }     private: }; vector<node>s; int n; inline int read(){     char c;while(c=getchar(),c==' '||c=='\n');int data=c-48;     while(c=getchar(),c>='0'&&c<='9')data=(data<<1)+(data<<3)+c-48;return data; } int main(){     scanf("%d",&n);     FOR(i,1,n)s.push_back((node){read(),read()});     vector<node>::iterator minn=s.begin();     for(vector<node>::iterator pos=s.begin();pos!=s.end();++pos)         if(*minn>*pos)             minn=pos;     printf("%d %d\n",(*minn).x,(*minn).y);     return 0; }