Matrix condition not outputting result C++

发布于 2020-11-29 13:05:24

For every column that contains the minimum number of the whole matrix, I want to replace the column entirely with the minimum number.

e.g:

I came up with this idea:

step 1: find minimum
step 2: create a bool variable and make it false (so active=false)
step 3: go through every column and check if it has the minimum number, if it does -> restart the loop 
and make the bool variable true (so active=true). If active==true, replace the column with the minimum number

Here's the code I wrote:

int main(){
    int i, j, n=4, m=4, v[101][101];
    for(i=0; i<n; i++){
        for(j=0; j<m; j++){
            cin>>v[i][j];
        }
    }
    int minv=1000000000;
    for(i=0; i<n; i++){
        for(j=0; j<m; j++){
            if(v[i][j]<minv){
                minv=v[i][j];
            }
        }
    }
    bool active=false;
    for(j=0; j<m; j++){
        for(i=0; i<n; i++){
            if(v[i][j]==minv){
                i=0;
                active=true;
            }
            if(active){
                v[i][j]=minv;
            }
        }
    }
    for(i=0; i<n; i++){
        for(j=0; j<m; j++){
            cout<<v[i][j]<<" ";
        }
        cout<<endl;
    }
}

My problem is that the compiler doesn't output anything. I assume it's the

for(j=0; j<m; j++){
        for(i=0; i<n; i++){
            if(v[i][j]==minv){
                i=0;
                active=true;
            }
            if(active){
                v[i][j]=minv;
            }
        }
    }

Piece of code. Could you guys help me out?

Questioner

dr 21

Viewed

Original

#include <iostream> #include <vector> int main() { std::vector<std::vector<int>> v = { {8, 3, 3, 7}, {2, 1, 6, 1}, {8, 1, 3, 1}, {9, 1, 7, 1}}; std::vector<int> min_row; int minv = v[0][0]; //Here we find min value of matrix for (auto i : v) for (auto j : i) if (j < minv) minv = j; //Here we find columns that hold min value for (auto i : v) for (size_t j = 0; j < i.size(); j++) if (i.at(j) == minv) min_row.push_back(j); //After looping trough columns that has //min values we change all values to min for (auto j : min_row) //Notice here we used reference so we could actually change the value for (auto &i : v) i.at(j) = minv; //Here we just print out our matrix for (auto i : v) { for (auto j : i) std::cout << j << " "; std::cout << std::endl; } return 0; }

Matrix condition not outputting result C++

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