| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 491212 |
2021-11-30T19:06:28 Z |
rainboy |
Paint (COI20_paint) |
C |
|
97 ms |
10572 KB |
#include <stdio.h>
#include <string.h>
#define NM 200000
#define S 456
#define C 456
int di[] = { -1, 1, 0, 0 };
int dj[] = { 0, 0, -1, 1 };
int rep[C], c;
int ds[NM], sz[NM], aa[NM], cc[NM], tt[NM], time; char adj[NM][C];
int qu[NM * 4], n, m, cnt;
int find(int i) {
return ds[i] < 0 ? i : (ds[i] = find(ds[i]));
}
void dfs1(int i, int j, int i_, int j_, int b) {
int h;
if (i < 0 || i >= n || j < 0 || j >= m || tt[i * m + j] == time)
return;
tt[i * m + j] = time;
if (find(i * m + j) != find(i_ * m + j_)) {
if (aa[find(i * m + j)] == b)
qu[cnt++] = i * m + j;
return;
}
for (h = 0; h < 4; h++)
dfs1(i + di[h], j + dj[h], i_, j_, b);
}
void dfs2(int i, int j, int c) {
int h;
if (i < 0 || i >= n || j < 0 || j >= m || tt[i * m + j] == time)
return;
tt[i * m + j] = time;
adj[find(i * m + j)][c] = 1;
if (find(i * m + j) != find(rep[c]))
return;
for (h = 0; h < 4; h++)
dfs2(i + di[h], j + dj[h], c);
}
void join(int i, int j) {
i = find(i);
j = find(j);
if (i == j)
return;
if (sz[i] + sz[j] > S) {
if (cc[i] == -1 && cc[j] == -1) {
rep[cc[i] = cc[j] = c++] = i;
time++, dfs2(i / m, i % m, cc[i]);
time++, dfs2(j / m, j % m, cc[j]);
}
else if (cc[i] == -1 && cc[j] != -1) {
cc[i] = cc[j];
time++, dfs2(i / m, i % m, cc[i]);
}
else if (cc[i] != -1 && cc[j] == -1) {
cc[j] = cc[i];
time++, dfs2(j / m, j % m, cc[j]);
}
}
if (ds[i] > ds[j])
ds[i] = j, sz[j] += sz[i];
else {
if (ds[i] == ds[j])
ds[i]--;
ds[j] = i, sz[i] += sz[j];
}
}
int propagate(int ij) {
while (1) {
int h, upd;
ij = find(ij), upd = 0;
for (h = 0; h < c; h++)
if (adj[ij][h]) {
int ij_ = find(rep[h]);
if (ij_ != ij && aa[ij_] == aa[ij]) {
join(ij_, ij);
upd = 1;
break;
}
}
if (!upd)
break;
}
return ij;
}
int main() {
int q, i, j, ij;
scanf("%d%d", &n, &m);
for (i = 0; i < n; i++)
for (j = 0; j < m; j++)
scanf("%d", &aa[i * m + j]);
for (ij = 0; ij < n * m; ij++)
ds[ij] = -1, sz[ij] = 1, cc[ij] = -1;
for (i = 0; i < n; i++)
for (j = 0; j < m; j++) {
if (i > 0 && aa[i * m + j] == aa[(i - 1) * m + j])
join(i * m + j, (i - 1) * m + j);
if (j > 0 && aa[i * m + j] == aa[i * m + (j - 1)])
join(i * m + j, i * m + (j - 1));
}
scanf("%d", &q);
while (q--) {
int a;
scanf("%d%d%d", &i, &j, &a), i--, j--;
ij = find(i * m + j);
if (aa[ij] == a)
continue;
ij = propagate(ij);
if (sz[ij] <= S) {
cnt = 0, time++, dfs1(i, j, i, j, a);
while (cnt--)
join(ij, qu[cnt]);
}
aa[ij] = a;
}
for (i = 0; i < n; i++) {
for (j = 0; j < m; j++)
printf("%d ", aa[find(i * m + j)]);
printf("\n");
}
return 0;
}
Compilation message
paint.c: In function 'main':
paint.c:100:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
100 | scanf("%d%d", &n, &m);
| ^~~~~~~~~~~~~~~~~~~~~
paint.c:103:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
103 | scanf("%d", &aa[i * m + j]);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
paint.c:113:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
113 | scanf("%d", &q);
| ^~~~~~~~~~~~~~~
paint.c:117:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
117 | scanf("%d%d%d", &i, &j, &a), i--, j--;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Correct |
1 ms |
332 KB |
Output is correct |
| 3 |
Correct |
4 ms |
588 KB |
Output is correct |
| 4 |
Incorrect |
6 ms |
916 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
42 ms |
2312 KB |
Output is correct |
| 2 |
Incorrect |
97 ms |
4664 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
58 ms |
10572 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
60 ms |
5396 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
