#include <stdio.h>
#include <stdlib.h>
#define MAXN 10
typedef struct
{
int row, col;
int val;
}RcdType;
int n, length;
int map[MAXN+2][MAXN+2];
RcdType rcd[MAXN*MAXN];
int decv[MAXN*MAXN];
int decx[MAXN*MAXN];
int Comp(const void *p1, const void *p2)
{
RcdType *e1 = (RcdType *)p1;
RcdType *e2 = (RcdType *)p2;
if (e1->val > e2->val)
return -1;
else if (e1->val < e2->val)
return 1;
else
return 0;
}
int Work()
{
int i, j, k, r, c;
int res = rcd[0].val, idx = 0;
int d[4][2] = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
qsort((void *)rcd, length, sizeof(RcdType), Comp);
for (i=0; i<=n+1; i++)
map[0][i] = map[i][0] = map[n+1][i] = map[i][n+1] = -1;
for (i=0; i<length; i++)
map[rcd[i].row][rcd[i].col] = i;
for (i=length-1; i>=0; i--)
{
decv[i] = rcd[i].val;
decx[i] = -1;
for (j=0; j<4; j++)
{
r = rcd[i].row+d[j][0];
c = rcd[i].col+d[j][1];
k = map[r][c];
if (k!=-1 && rcd[i].val>rcd[k].val)
if (decv[i] < rcd[i].val+decv[k])
{
decv[i] = rcd[i].val+decv[k];
decx[i] = k;
}
}
if (res < decv[i])
{
res = decv[i];
idx = i;
}
}
return idx;
}
void Display(int idx)
{
int i = idx, cnt = 0;
printf("max sequence sum = %d\n", decv[idx]);
printf("one sequence is :");
while (i != -1)
{
printf(" %d", rcd[i].val);
i = decx[i];
cnt++;
}
printf("\nsequence length = %d\n\n", cnt);
}
int ReadData()
{
int i, j, k, v;
if (scanf("%d", &n) == EOF)
return 0;
length = n*n;
for (i=1; i<=n; i++)
for (j=1; j<=n; j++)
{
scanf("%d", &v);
k = (i-1)*n+j-1;
rcd[k].row = i;
rcd[k].col = j;
rcd[k].val = v;
}
return 1;
}
int main()
{
int idx;
freopen("in.txt", "r", stdin);
freopen("out.txt", "w", stdout);
while (ReadData())
{
idx = Work();
Display(idx);
}
return 0;
}
正文
最长序列2005-02-17 19:36:00
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