在向量中查找一组整数 [英] Finding a group of integers in a vector
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问题描述
在我的任务中,我应该找到向量中是否存在40-50之间的数字,如果它存在的是它们的索引。
没有解决方案我每次尝试零作为cnt的值时都会尝试工作,我最近开始使用向量,我认为这里的问题是我将它们视为数组
我尝试过:
void Findthem(vector< cam>& W){
int cnt = 0;
vector< int> r = {40,41,42,43,44,45,46,47,48,49,50}; //想要年龄
for(int i = 0; i< W.size(); i ++)
{
for(int j = 0; j< 11; j ++)
{
if(W [i] .age!= r [j])
{
cnt ++;
}
}
}
void Findthem(vector< cam>& W){
int cnt = 0;
for(int i = 0; i< W.size(); i ++)
{
if(W [i] .age> 40&& W [i]。年龄<50)
{
cnt ++;
}
}
解决方案
在这两种情况下,您都在计算事件的数量但是当函数返回时,计数丢失。更改函数,使其返回计数值。
该任务是一个简单的homwework。你需要从40循环到50并找到索引。
vector< int>水库;
for(int j = 40; j< 50; j ++)
{
res.push_back(-1); //找不到
for(int i = 0; i< ; W.size(); i ++)
{
if(W [i] .age == j])//找到
{
res [j-40] = i; //设置索引作为结果
break;
}
}
}
In my task I should find if there exists numbers between 40-50 in a vector and if it exists what's the index of them.
None of the solutions that I've tried works each time I get zero as the value of cnt, I've recently started to work with vectors and I think the issue here is that I'm treating them like arrays
What I have tried:
void Findthem( vector<cam> & W){ int cnt = 0; vector <int> r = {40,41,42,43,44,45,46,47,48,49,50}; //wanted ages for (int i=0; i<W.size(); i++) { for (int j=0; j<11; j++) { if ( W[i].age != r[j] ) { cnt++; } } }
void Findthem( vector<cam> & W){ int cnt = 0; for (int i=0; i<W.size(); i++) { if ( W[i].age > 40 && W[i].age < 50 ) { cnt++; } }
解决方案
In both cases you are counting the occurrences but when the function returns that count is lost. Change the function so it returns the count value.
That task is a simple homwework. You need to loop from 40 to 50 and find the index.
vector <int> res; for (int j=40; j<50; j++) { res.push_back(-1);//not found for (int i=0; i<W.size(); i++) { if ( W[i].age == j] )//found { res[j-40] = i;//set index as result break; } } }Learn to use the debugger.
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