觉得和矩阵没什么关系,直接看成一个数列,从中位数开始,小的增加d,大的减小d,求操作多少次即可。
如果取余不相等,那肯定不可能转换成同一个数字。
#include<stdio.h>
#include<iostream>
#include<math.h>
#include<string.h>
#include<iomanip>
#include<stdlib.h>
#include<ctype.h>
#include<algorithm>
#include<deque>
#include<functional>
#include<iterator>
#include<vector>
#include<list>
#include<map>
#include<queue>
#include<set>
#include<stack>
#define CPY(A, B) memcpy(A, B, sizeof(A))
typedef long long LL;
typedef unsigned long long uLL;
const int MOD = 1e9 + 7;
const int INF = 0x3f3f3f3f;
const LL INFF = 0x3f3f3f3f3f3f3f3fLL;
const double EPS = 1e-9;
const double OO = 1e20;
const double PI = acos (-1.0);
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};
using namespace std;
int M[1000010];
int main() {
int n,m,d,ans=0,i;
scanf ("%d%d%d",&n,&m,&d);
int num=n*m;
for (i=0; i<num; i++) {
scanf ("%d",&M[i]);
if (M[i]%d!=M[0]%d) {printf ("-1\n"); return 0;}//can not make all matrix elements equal
}
sort (M,M+num);
int mid=M[num/2];
for (i=0; i<num; i++) {
ans+=abs (M[i]-mid) /d;// the minimum number of moves
}
printf ("%d\n",ans);
return 0;
}