error messages:
No operator ">>" matches these operands
-- Operand type: std::istream>>graphC/C++(349)
source code:
#include<bits/stdc++.h>
using namespace std;
int main()
{
inth,w;
vector<vector<int>>P[9][10001];
cin>>h>>w;
for(inti=1;i<=h;i++){
For(int j=1;j<=w;j++)cin>>P[i][j];// An error occurs in the > part of this line.
}
return 0;
}
Subjectively, what we were looking for was an array of arrays in two dimensions.
std::vector<T>v1; by itself, where v1 is a variable-length array (in this notation, the number of elements is 0)
std::vector<std::vector<T>>v2;, where v2 is "variable length array with variable length array elements" (this is not practical since there are only 0 arrays with zero elements).
Therefore, std::vector<std::vector<int>v3[9][10001]; becomes a "fixed length array of fixed length arrays" of "variable length arrays with variable length arrays as elements" and becomes a four-dimensional array.
If you want a fixed-length two-dimensional array, the answer is int P[9][10001];.
The following is an aside
The first step for tomorrow: std::vector<int>vec(10001); and cCompatible ArrayTr[1000] memory placement is different.When you can imagine this
The second step for tomorrow: std::vector<std::vector<int>>v2; will now be able to imagine what memory placement looks like.Then you will understand what code is needed to increase the number of elements in v2.
Furthermore
The default stack size for Win32(x86) is 1MiB
intP[9][10001]; is 351.6KiB
So you can't create at most three P automatic variables. You can create as many vector as memory allows, so it's not bad to learn how to use vector properly for the future, but it's also a good option to make it a normal automatic variable based on YAGNI rules.
#include<bits/stdc++.h>do not manage or large areato be able to ask questions tagged with c++ in the futureThis writing style is non-standard specific to the competition programming industry.If Oira's subordinates write something like this, I'll go back to the source code review.
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