145 条题解
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做出这道题,那么恭喜你踏上了万里征程的第一步!
这是一道适合入门级选手练手的题目,本篇题解为大家介绍 cin 和 cout 。
cin :标准输入流。
输入:
cin>>变量名;
多个输入:cin>>变量名1>>变量名2……;
cout :标准输出流。
输出变量:
cout<<变量名;
输出单个字符:cout<<'字符';
输出一串字符:cout<<"一串字符";
输出换行:cout<<endl;
本题代码及解析
#include<iostream>//头文件,可调用cin、cout using namespace std;//标准命名空间 int main(){//主函数 int a,b;//定义变量 cin>>a>>b;//输入a,b cout<<a+b;//输出a,b之和 return 0;//返回0 }
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LCT解法
#include <iostream> #include <cstring> #include <cstdio> #include <cstring> using namespace std; struct node { int data,rev,sum; node *son[2],*pre; bool judge(); bool isroot(); void pushdown(); void update(); void setson(node *child,int lr); }lct[233]; int top,a,b; node *getnew(int x) { node *now=lct+ ++top; now->data=x; now->pre=now->son[1]=now->son[0]=lct; now->sum=0; now->rev=0; return now; } bool node::judge(){return pre->son[1]==this;} bool node::isroot() { if(pre==lct)return true; return !(pre->son[1]==this||pre->son[0]==this); } void node::pushdown() { if(this==lct||!rev)return; swap(son[0],son[1]); son[0]->rev^=1; son[1]->rev^=1; rev=0; } void node::update(){sum=son[1]->sum+son[0]->sum+data;} void node::setson(node *child,int lr) { this->pushdown(); child->pre=this; son[lr]=child; this->update(); } void rotate(node *now) { node *father=now->pre,*grandfa=father->pre; if(!father->isroot()) grandfa->pushdown(); father->pushdown();now->pushdown(); int lr=now->judge(); father->setson(now->son[lr^1],lr); if(father->isroot()) now->pre=grandfa; else grandfa->setson(now,father->judge()); now->setson(father,lr^1); father->update();now->update(); if(grandfa!=lct) grandfa->update(); } void splay(node *now) { if(now->isroot())return; for(;!now->isroot();rotate(now)) if(!now->pre->isroot()) now->judge()==now->pre->judge()?rotate(now->pre):rotate(now); } node *access(node *now) { node *last=lct; for(;now!=lct;last=now,now=now->pre) { splay(now); now->setson(last,1); } return last; } void changeroot(node *now) { access(now)->rev^=1; splay(now); } void connect(node *x,node *y) { changeroot(x); x->pre=y; access(x); } void cut(node *x,node *y) { changeroot(x); access(y); splay(x); x->pushdown(); x->son[1]=y->pre=lct; x->update(); } int query(node *x,node *y) { changeroot(x); node *now=access(y); return now->sum; } int main() { scanf("%d%d",&a,&b); node *A=getnew(a); node *B=getnew(b); connect(A,B); cut(A,B); connect(A,B); printf("%d\n",query(A,B)); return 0; }
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#include<bits/stdc++.h> using namespace std; const int N=100001; int a[N],b[N],ml; void add(int a[],int b[]) { int cnt=0; for(int i=1;i<=ml+1;i++) { cnt+=a[i]+b[i]; a[i]=cnt%10; cnt/=10; } return; } void print(int a[]) { int i; for(i=ml+1;i>0&&!a[i];i--); if(!i) { cout<<0; return; } while(i) { cout<<a[i--]; } } int main() { string sa,sb; cin>>sa>>sb; int la=sa.size(),lb=sb.size(); ml=la>lb?la:lb; for(int i=1;i<=la;i++) { a[i]=sa[la-i]-'0'; } for(int i=1;i<=lb;i++) { b[i]=sb[lb-i]-'0'; } add(a,b); print(a); return 0; }
信息
- ID
- 56
- 时间
- 1000ms
- 内存
- 1024MiB
- 难度
- 1
- 标签
- 递交数
- 9107
- 已通过
- 4056
- 上传者