#include <bits/stdc++.h>
#define DIM 2010
#define DIMBUFF 30000000
#define INF 2000000000
using namespace std;
int a[DIM][DIM],b[DIM][DIM],viz[DIM][DIM];
struct idk{
int val,l,c;
} v[DIM*DIM];
pair<int,int> c[DIM*DIM];
int di[] = {-1,1,0,0};
int dj[] = {0,0,-1,1};
int n,m,i,j,sol,mini,maxi,k,pos;
char buff[DIMBUFF];
int verif (int val){
int st = 1, dr = k, poz = 0;
while (st <= dr){
int mid = (st+dr)>>1;
if (v[mid].val <= mini + val){
poz = mid;
st = mid+1;
} else dr = mid-1;
}
if (v[poz+1].val < maxi - val)
return 0;
/// toate valorile < maxi - val trb puse in zona minimelor
/*for (int i=1;i<=n;i++)
for (int j=1;j<=m;j++)
viz[i][j] = 0;*/
memset (viz,0,sizeof viz);
for (int i=1;i<=k;++i){
if (v[i].val >= maxi - val)
break;
int lin = v[i].l, col = v[i].c;
if (viz[lin][col])
continue;
int p = 1, u = 1;
c[1] = make_pair(lin,col);
viz[lin][col] = 1;
while (p <= u){
int ic = c[p].first;
int jc = c[p].second;
p++;
for (int dir=0;dir<=3;++dir){
int iv = ic + di[dir];
int jv = jc + dj[dir];
if (iv >= lin && iv <= n && jv >= 1 && jv <= col && !viz[iv][jv]){
viz[iv][jv] = 1;
c[++u] = make_pair(iv,jv);
}}}}
int maxim = 0, maxim2 = 0, minim = INF, minim2 = INF;
for (int i=1;i<=n;++i)
for (int j=1;j<=m;++j){
if (viz[i][j]){
minim = min (minim,a[i][j]);
maxim = max (maxim,a[i][j]);
} else {
minim2 = min (minim2,a[i][j]);
maxim2 = max (maxim2,a[i][j]);
}}
if (max (maxim - minim, maxim2 - minim2) > val)
return 0;
return 1;
}
void solve (){
int st = 0, dr = maxi - mini, val;
while (st <= dr){
int mid = (st+dr)>>1;
if (verif (mid)){
val = mid;
dr = mid-1;
} else st = mid+1;
}
sol = min (sol,val);
}
inline int cmp (idk a, idk b){
return a.val < b.val;
}
void roteste(){
for (i=1;i<=n;++i)
for (j=1;j<=m;++j)
b[m-j+1][i] = a[i][j];
swap (n,m);
k = 0;
for (i=1;i<=n;++i)
for (j=1;j<=m;++j){
a[i][j] = b[i][j];
v[++k] = {a[i][j],i,j};
}
sort (v+1,v+k+1,cmp);
}
int get_nr(){
while (!(buff[pos] >= '0' && buff[pos] <= '9'))
++pos;
int nr = 0;
while (buff[pos] >= '0' && buff[pos] <= '9'){
nr = nr*10 + buff[pos] - '0';
++pos;
}
return nr;
}
int main (){
//FILE *fin = fopen ("date.in","r");
//FILE *fout = fopen ("date.out","w");
FILE *fin = stdin;
FILE *fout = stdout;
fread (buff,1,DIMBUFF,fin);
//cin>>n>>m;
n = get_nr(), m = get_nr();
mini = INF;
for (i=1;i<=n;++i)
for (j=1;j<=m;++j){
//cin>>a[i][j];
a[i][j] = get_nr();
mini = min (mini,a[i][j]);
maxi = max (maxi,a[i][j]);
v[++k] = {a[i][j],i,j};
}
sort (v+1,v+k+1,cmp);
sol = INF;
solve();
roteste();
solve();
roteste();
solve();
roteste();
solve();
fprintf(fout,"%d",sol);
return 0;
}
Compilation message
joioi.cpp: In function 'int main()':
joioi.cpp:125:11: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
fread (buff,1,DIMBUFF,fin);
~~~~~~^~~~~~~~~~~~~~~~~~~~
joioi.cpp: In function 'void solve()':
joioi.cpp:76:35: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
int st = 0, dr = maxi - mini, val;
^~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
34 ms |
16256 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
34 ms |
16256 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
34 ms |
16256 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
