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timLatCat.cpp
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140 lines (116 loc) · 1.98 KB
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#include <stdio.h>
#include "timLatCat.h"
void capPhatVungNho(int **&a, int m, int n)
{
a = new int*[m];
for (int i = 0; i < m; i++)
{
a[i] = new int [n];
}
}
void nhapDuLieu(int **&a, int &m, int &n)
{
scanf("%d%d", &m, &n);
capPhatVungNho(a, m, n);
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
scanf("%d", &a[i][j]);
}
}
}
void xoaDuLieu(int **&a, int m)
{
for (int i = 0; i < m; i++)
{
delete[]a[i];
}
delete[]a;
}
void Init(int **a, int m, int n, int **&T, int **&track)
{
capPhatVungNho(T, m, n);
capPhatVungNho(track, m, n);
for (int i = 0; i < n; i++)
{
T[m - 1][i] = a[m - 1][i];
track[m - 1][i] = -2;
}
}
void loTrinh(int **track, int i, int j, int m, int n, int *&way)
{
if (i == m)
return;
else
{
loTrinh(track, i + 1, j + track[i][j], m, n, way);
way[i] = j;
}
}
void partTimDuong(int **a, int m, int n, int **T, int **track, int &k)
{
int buocdi[] = { -1, 0, 1 };
for (int i = m - 2; i >= 0; i--)
{
for (int j = 0; j < n; j++)
{
int min = 0;
bool kt = false;
for (int k = 0; k < 3; k++)
{
if (j + buocdi[k] < 0 || j + buocdi[k] >= n)
continue;
int p = T[i + 1][j + buocdi[k]];
if (kt == false || p < min)
{
min = p;
track[i][j] = buocdi[k];
kt = true;
}
}
T[i][j] = a[i][j] + min;
}
}
int min = T[0][0];
k = 0;
for (int i = 1; i < n; i++)
{
if (T[0][i] < min)
{
min = T[0][i];
k = i;
}
}
}
void timDuong(int **a, int m, int n, int *&way)
{
int **T, **track;
Init(a, m, n, T, track);
int k;
partTimDuong(a, m, n, T, track, k);
loTrinh(track, 0, k, m, n, way);
xoaDuLieu(T, m);
xoaDuLieu(track, m);
}
void catAnh(int **&a, int &m, int &n, int *T)
{
for(int i = 0; i<m; i++)
{
for(int j = T[i]; j< n-1; j++)
{
a[i][j] = a[i][j+1];
}
}
n--;
}
void timLatCat(int **&a, int &m, int &n, int k)
{
for(int i = 0; i< k; i++)
{
int *way = new int [m];
timDuong(a,m,n, way);
catAnh(a, m, n, way);
delete []way;
}
}