在我的程序中哪里出错？ [英] where exactly went wrong in my program??

问题描述

我正在尝试创建一个N维向量，每个向量都有i个元素，然后我需要将所有向量添加到一个向量中，但是，如果输入是：

*例如：

N = 2

i = 3

first vector = 1 2 3
$
秒vector = 4 5 6

答案应该是5 7 9

但我得到的是2 6 12.为什么??

int main（）{

int N，i;

cin>> N;

cin>> i;

long long int元素;



vector< vector< long long int>> vec;

vector< long long int> vec1;

for（int x = 0; x< N; x ++）

{

for（int y = 0; y< i ; y ++）

{

cin>> element;

vec1.push_back（element）;

}

vec.push_back（vec1）;



}

long long  int sum = 0;

vector< long long int> ; new_vec;

for（int h = 0; h< i; h ++）

{

for（int e = 0; e< N; e ++ ）

{

sum + = vec [e] [h];

}

new_vec.push_back（sum）;

}

< span style ="white-space：pre"> for（int z = 0; z< i; z ++）

{

cout<< new_vec [z]<< " " ;;

}

system（" pause"）;

}

解决方案

2016年11月3日晚上11:48，为什么dot net优于non dot net写道：

vector< ; vector< long long int>> vec;
$
vector< long long int> vec1;

for（int x = 0; x< N; x ++）

{

for（int y = 0; y< ; i; y ++）

{

cin>>元素;
$
vec1.push_back（元素）;

}

vec.push_back（vec1）;

在这附近的某处清除vec1，或在循环内移动它的声明。如上所述，vec最终会持有两个向量{1,2,3}和{1,2,3,4,5,6}，因为你只是不断向vec1添加元素。

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I am trying to create an N dimensional vectors and each with i elements, then i need to add all the vectors into a single vector, However, if the inputs are:

* for example:
N=2
i=3
first vector=1 2 3
second vector=4 5 6

the answer should be 5 7 9

but what i got is 2 6 12. Why??

int main() {
int N,i;
cin >> N;
cin >> i;
long long int element;

vector<vector<long long int>> vec;
vector<long long int> vec1;
for (int x = 0; x < N; x++)
{
for (int y = 0; y < i; y++)
{
cin >> element;
vec1.push_back(element);
}
vec.push_back(vec1);

}
long long  int sum = 0;
vector<long long int> new_vec;
for (int h = 0; h<i; h++)
{
for (int e = 0; e<N; e++)
{
sum+=vec[e][h];
}
new_vec.push_back(sum);
}
for (int z = 0; z < i; z++)
{
cout << new_vec[z] << " ";
}
system("pause");
}

解决方案

On 11/3/2016 11:48 PM, Why is dot net better than non dot net wrote:

vector<vector<long long int>> vec;
vector<long long int> vec1;
for (int x = 0; x < N; x++)
{
for (int y = 0; y < i; y++)
{
cin >> element;
vec1.push_back(element);
}
vec.push_back(vec1);

Clear vec1 somewhere around here, or move its declaration inside the loop. As written, vec ends up holding two vectors, {1, 2, 3} and {1, 2, 3, 4, 5, 6}, because you just keep adding elements to vec1.

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