标签:注意 ring strong isp closed end nbsp string 迭代
merge函数的作用是:将两个已经排好序的序列合并为一个有序的序列。
函数参数:merge(first1,last1,first2,last2,result,compare);
firs1t为第一个容器的首迭代器,last1为第一个容器的末迭代器;
first2为第二个容器的首迭代器,last2为容器的末迭代器;
result为存放结果的容器,comapre为比较函数(可略写,默认为合并为一个升序序列)。
注意
使用的时候result,如果用的vector,必须先resize一下,比如:(注意到此时a和b都已经是有序的啦!)
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<queue>
#include<stack>
#include<cmath>
#include<set>
#include<map>
using namespace std;
#define ll long long
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
typedef pair<int,int>P;
const int INF=0x3f3f3f3f;
const int N=100005;
vector<int>a,b,c;
int main(){
a.push_back(1);
a.push_back(3);
a.push_back(5);
a.push_back(7);
b.push_back(2);
b.push_back(4);
b.push_back(6);
b.push_back(8);
c.resize(8);
merge(a.begin(),a.end(),b.begin(),b.end(),c.begin());
for(int i=0;i<c.size();i++){
printf("%d ",c[i]);
}
printf("\n");
}
自定义排序规则:
#include<iostream> #include<cstdio> #include<algorithm> #include<string> #include<cstring> #include<queue> #include<stack> #include<cmath> #include<set> #include<map> using namespace std; #define ll long long #define lson l,m,rt<<1 #define rson m+1,r,rt<<1|1 typedef pair<int,int>P; const int INF=0x3f3f3f3f; const int N=100005; struct A{ int x,y; }; vector<A>a,b,c; bool cmp(A a,A b){ return a.x<b.x; } int main(){ a.push_back({1,9}); a.push_back({3,8}); a.push_back({5,7}); b.push_back({2,1}); b.push_back({4,2}); b.push_back({6,4}); c.resize(6); merge(a.begin(),a.end(),b.begin(),b.end(),c.begin(),cmp); for(int i=0;i<c.size();i++){ printf("%d %d\n",c[i].x,c[i].y); } }
原文链接:https://blog.csdn.net/m0_37579232/article/details/89785635
标签:注意 ring strong isp closed end nbsp string 迭代
原文地址:https://www.cnblogs.com/qq1415584788/p/14662477.html