Monday, September 16, 2024

# Codeforces Round #387 (Div. 2), problem: (E) Comments Solution in C/C++

Codeforces Round #387 (Div. 2), problem: (E) Comments Solution in C/C++

```#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define N	1000000

int ccnt;

struct comment {
char *s;
int d, i;
} cc[N];

char *ss[N];

int parse(int d, int i) {
int k = atoi(ss[i + 1]);

cc[ccnt].s = strdup(ss[i]);
cc[ccnt].d = d;
cc[ccnt++].i = i;
i += 2;
while (k-- > 0)
i = parse(d + 1, i);
return i;
}

int compare(const void *a, const void *b) {
struct comment *pa = (struct comment *) a;
struct comment *pb = (struct comment *) b;

return pa->d != pb->d ? pa->d - pb->d : pa->i - pb->i;
}

int main() {
int k_, k, i, j, m;
static char s[N + 1], *t;

scanf("%s", s);
t = strtok(s, ",");
for (k_ = 0; t != NULL; ss[k_++] = strdup(t), t = strtok(NULL, ","))
;
k = k_ / 2;
ccnt = 0;
for (i = 0; i < k_; i = parse(0, i))
;
qsort(cc, k, sizeof(*cc), compare);
m = cc[k - 1].d + 1;
printf("%d\n", m);
for (i = 0, j = 0; i < m; i++) {
while (j < k && cc[j].d == i) {
printf("%s ", cc[j].s);
j++;
}
printf("\n");
}
return 0;
}```

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