This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <stdio.h>
#define N 1000
#define M 1000
int main() {
static int aa[N][M], ll[N], ii[N], pp[N], qq[N];
static char active[N];
int n, m, h, i, j, r;
long long ans;
scanf("%d%d", &n, &m);
for (i = 0; i < n; i++)
for (j = 0; j < m; j++)
scanf("%d", &aa[i][j]);
for (i = 0; i < n; i++)
ii[i] = i;
ans = 0;
for (r = 0; r < m; r++) {
int tmp, cnt;
for (i = 0, j = 0; j < n; j++)
if (r > 0 && aa[ii[j]][r] != aa[ii[j]][r - 1])
ll[ii[j]] = r;
else
tmp = ii[j], ii[j] = ii[i], ii[i] = tmp, i++;
for (i = 0; i < n; i++)
active[i] = 0, pp[i] = qq[i] = i;
cnt = 0;
for (h = 0; h < n; h++) {
int p, q;
i = ii[h];
active[i] = 1;
p = i, q = i;
if (i > 0 && active[i - 1] && aa[i][r] == aa[i - 1][r])
cnt -= (i - pp[i - 1]) * (i - pp[i - 1] + 1) / 2, p = pp[i - 1];
if (i + 1 < n && active[i + 1] && aa[i][r] == aa[i + 1][r])
cnt -= (qq[i + 1] - i) * (qq[i + 1] - i + 1) / 2, q = qq[i + 1];
cnt += (q - p + 1) * (q - p + 2) / 2;
qq[p] = q, pp[q] = p;
ans += ((h + 1 == n ? r + 1 : ll[ii[h + 1]]) - ll[ii[h]]) * cnt;
}
}
printf("%lld\n", ans);
return 0;
}
Compilation message (stderr)
bob.c: In function 'main':
bob.c:12:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
12 | scanf("%d%d", &n, &m);
| ^~~~~~~~~~~~~~~~~~~~~
bob.c:15:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
15 | scanf("%d", &aa[i][j]);
| ^~~~~~~~~~~~~~~~~~~~~~
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