Лаб матрици

1. Сума на матрица
#include <stdio.h>
int main()
{
    int m,n,i,j,suma=0;
    scanf("%d%d",&m,&n);
    int a[m][n];
    for(i=1;i<=m;i++){
        for(j=1;j<=n;j++){
            scanf("%d",&a[i][j]);
            suma+=a[i][j];
        }
    }
    printf("%d",suma);
    return 0;
}

2. Трансформација на матрица
#include <stdio.h>
#define MAX 100
int main()
{
    int i,n,j;
    float a[MAX][MAX],b[MAX][MAX];
    float pg=0,ps=0;
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {for(j=0;j<n;j++)
            {scanf("%f",&a[i][j]);
             if(i>j)
                pg=pg+a[i][j];
             if(i+j>n-1)
                ps=ps+a[i][j];}}
     for(i=0;i<n;i++)
     {for(j=0;j<n;j++)
     {
        if(i==j&&i+j==n-1)
            b[i][j]=ps+pg;
        else if(i+j ==n-1)
            b[i][j]+=ps;
        else if(i==j)
            b[i][j]+=pg;
        else
            b[i][j]=0;
     }
     }
 for(i=0;i<n;i++)
 {for(j=0;j<n;j++)
 {printf("%.1f ",b[i][j]);}
    printf("\n");}

return 0; }

3. Длапки во матрица
#include <stdio.h>
int main()
{
    int m, n, i, j;
    scanf("%d %d", &m, &n);
    int a[m][n];
    for(i = 0; i < m; i++)
    {
        for(j = 0; j < n; j++)
        {
            scanf("%d", &a[i][j]);
        }
    }
    for(i = 0; i < m; i++)
    {
        for(j = 0; j < n; j++)
        {
            if(i == 0)
            {
                if(j == 0)
                {
                    if(a[i][j] < a[i][j+1] && a[i][j] < a[i+1][j])
                    {
                        printf("%d ", a[i][j]);
                    }
                }
                if(j == n-1)
                {
                    if(a[i][j] < a[i][j-1] && a[i][j] < a[i+1][j])
                    {
                        printf("%d ", a[i][j]);
                    }
                }
                if(j != 0 && j != n-1)
                {
                    if(a[i][j] < a[i][j-1] && a[i][j] < a[i][j+1] && a[i][j] < a[i+1][j])
                    {
                        printf("%d ", a[i][j]);
                    }
                }
            }
            if(j == 0)
            {
                if(i == m-1)
                {
                    if(a[i][j] < a[i-1][j] && a[i][j] < a[i][j+1])
                    {
                        printf("%d ", a[i][j]);
                    }
                }
                if(i != 0 && i != m-1)
                {
                    if(a[i][j] < a[i-1][j] && a[i][j] < a[i+1][j] && a[i][j] < a[i][j+1])
                    {
                        printf("%d ", a[i][j]);
                    }
                }
            }
            if(i == m-1)
            {
                if(j == n-1)
                {
                    if(a[i][j] < a[i][j-1] && a[i][j] < a[i-1][j])
                    {
                        printf("%d ", a[i][j]);
                    }
                }
                if(j != 0 && j != n-1)
                {
                    if(a[i][j] < a[i][j-1] && a[i][j] < a[i-1][j] && a[i][j] < a[i][j+1])
                    {
                        printf("%d ", a[i][j]);
                    }
                }
            }
            if(j == n-1)
            {
                if(i != 0 && j != m-1)
                {
                    if(a[i][j] < a[i-1][j] && a[i][j] < a[i][j-1] && a[i][j] < a[i+1][j])
                    {
                        printf("%d ", a[i][j]);
                    }
                }
            }
            if(i != 0 && j != 0 && i != m-1 && j != n-1)
            {
                if(a[i][j] < a[i][j-1] && a[i][j] < a[i-1][j] && a[i][j] < a[i][j+1] && a[i][j] < a[i+1][j])
                    {
                        printf("%d ", a[i][j]);
                    }
            }
        }
    }
    return 0;
}


4. Праг
#include <stdio.h>
int main()
{
    int x,m,n,i,j,zbir=0;
    scanf("%d%d%d",&x,&m,&n);
    int a[m][n];
    for(i=1;i<=m;i++){
        for(j=1;j<=n;j++){
            scanf("%d",&a[i][j]);
        }
    }
    for(i=1;i<=m;i++){
        for(j=1;j<=n;j++){
            zbir+=a[i][j];
            if(j==n){
                if(zbir>x){
                    for(j=1;j<=n;j++)
                        a[i][j]=1;
                }
                else if(zbir<x){
                    for(j=1;j<=n;j++)
                        a[i][j]=-1;
                }
                else if(zbir==x){
                    for(j=1;j<=n;j++)
                        a[i][j]=0;
                }
            }
        }
        zbir=0;
    }
    for(i=1;i<=m;i++){
        for(j=1;j<=n;j++){
            printf("%d ",a[i][j]);
        }
        printf("\n");
    }
    return 0;
}