#include <bits/stdc++.h>
using namespace std;
#define scd(t) scanf("%d", &t)
#define sclld(t) scanf("%lld", &t)
#define forr(i, j, k) for (int i = j; i < k; i++)
#define frange(i, j) forr(i, 0, j)
#define all(cont) cont.begin(), cont.end()
#define mp make_pair
#define pb push_back
#define f first
#define s second
typedef long long int lli;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<lli> vll;
typedef vector<string> vs;
typedef vector<pii> vii;
typedef vector<vi> vvi;
typedef map<int, int> mpii;
typedef set<int> seti;
typedef multiset<int> mseti;
typedef long double ld;
void usaco()
{
freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
// freopen("problem.out", "w", stdout);
}
int h, w;
vvi grid;
vector<vb> vis, vis2;
int mi = 1e9+1;
int ma = 0;
pii mip, mapi;
void dfs(int x, int y, int v) {
if(x < 0 || x >= h || y < 0 || y >= w) return;
if(grid[x][y] > v) return;
if(vis[x][y]) return;
vis[x][y] = true;
dfs(x+1, y, v);
dfs(x, y+1, v);
dfs(x-1, y, v);
dfs(x, y-1, v);
}
void dfs2(int x, int y, int v) {
if(x < 0 || x >= h || y < 0 || y >= w) return;
if(grid[x][y] < v) return;
if(vis2[x][y]) return;
vis2[x][y] = true;
dfs2(x+1, y, v);
dfs2(x, y+1, v);
dfs2(x-1, y, v);
dfs2(x, y-1, v);
}
bool check(int x) {
vis = vis2 = vector<vb>(h, vb(w));
dfs(mip.f, mip.s, mi+x);
dfs2(mapi.f, mapi.s, ma-x);
frange(i, h) {
frange(j, w) {
if(!vis[i][j] && !vis2[i][j]) return false;
}
}
return true;
}
int main() {
// usaco();
scd(h);
scd(w);
grid = vvi(h, vi(w));
frange(i, h) {
frange(j, w) {
scd(grid[i][j]);
if(grid[i][j] < mi) {
mi = grid[i][j];
mip = mp(i, j);
}
if(grid[i][j] > ma) {
ma = grid[i][j];
mapi = mp(i, j);
}
}
}
int lo = 0;
int hi = 1e9;
while(lo != hi) {
int mid = (lo + hi)/2;
if(check(mid)) {
hi = mid;
}
else lo = mid+1;
}
printf("%d", lo);
}
Compilation message
joioi.cpp: In function 'void usaco()':
joioi.cpp:29:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
29 | freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joioi.cpp: In function 'int main()':
joioi.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | #define scd(t) scanf("%d", &t)
| ~~~~~^~~~~~~~~~
joioi.cpp:79:5: note: in expansion of macro 'scd'
79 | scd(h);
| ^~~
joioi.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | #define scd(t) scanf("%d", &t)
| ~~~~~^~~~~~~~~~
joioi.cpp:80:5: note: in expansion of macro 'scd'
80 | scd(w);
| ^~~
joioi.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
5 | #define scd(t) scanf("%d", &t)
| ~~~~~^~~~~~~~~~
joioi.cpp:85:13: note: in expansion of macro 'scd'
85 | scd(grid[i][j]);
| ^~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
344 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
344 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
344 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
