2016年北理工复试上机

题目来源：https://blog.youkuaiyun.com/u014552756/article/details/60801051

代码原创

1.学生成绩

#include<bits/stdc++.h>
using namespace std;
struct student{
	string name;
	vector<int> score;
	double average;
	int failed = 0;
}; 
bool cmp(student a, student b){
	return a.failed > b.failed;
}
void print(student a){
	cout<<a.name<<" : ";
	for(int i = 0; i < a.score.size(); i++){
		cout << a.score[i] << " ";
	}
	cout << "average : " <<a.average << " failed:" << a.failed << endl;
}
int main(){
	student tmp;
	vector<student> list;
	while(cin >> tmp.name){
		//memset(&tmp,0,sizeof(tmp));
		memset(&tmp.score,0,sizeof(tmp.score));
		tmp.failed = 0;
		int i = 0;
		int sum = 0;
		while(getchar()!='\n'){
			int s_tmp = 0;
			scanf("%d",&s_tmp);
			sum += s_tmp;
			tmp.score.push_back(s_tmp);
			if(s_tmp < 60){
				tmp.failed++;
			}
			i ++;
		}
		tmp.average = sum * 1.0 / i;
		list.push_back(tmp);
	}
	for(int i = 0; i < list.size(); i++){
		print(list[i]);
	}
	sort(list.begin(), list.end(), cmp);
	for(int i = 0; i < list.size(); i++){
		print(list[i]);
	}
	return 0;
}

2.提取字符串中的数字

#include<bits/stdc++.h>
using namespace std;
void print(string &s){
	//处理零和小数点之后输出
	if(s.length() == 1){
		cout << s << endl;
		return;
	}
	//处理前置0 
	int i = 0;
	if(s[0] == '+' || s[0] == '-')
		i = 1;
	while(s[i] == '0'){
		s.erase(s.begin()+i);
	} 
	if(s[0] == '.'){//如果是0.xx的情况，把0补回来 
		s.insert(s.begin(),'0');
	} 
	//如果是小数则处理后置0
	bool mark = 0;
	for(int j = 0; j < s.length(); j++){
		if(s[j] == '.'){
			mark = 1;
			break;
		}
	}
	if(mark){
		i = s.length() - 1;
		while(s[i] == '0'){
			s.erase(s.begin()+i);
			i--;
		}
		if(s[s.length()-1] == '.')
			s.erase(s.end()-1); 
	}
	
	cout << s << endl; 
	s = "";
	return;
}
int main(){
	string input;
	cin >> input;
	string num;
	bool flag = 0;
	for(int i = 0; i < input.length(); i++){
		if(input[i] == '+' || input[i] == '-' || (input[i] >= '0' && input[i] <= '9')){
			num += input[i++];
			while(input[i] == '.' || (input[i] >= '0' && input[i] <= '9')){
				num += input[i++];
			}
			print(num);
		}
	}
	return 0;
}