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 200000
unsigned int X = 12345;
int rand_() {
return (X *= 3) >> 1;
}
int ii[N], jj[N];
void sort(int *hh, int l, int r) {
while (l < r) {
int i = l, j = l, k = r, h = hh[l + rand_() % (r - l)], tmp;
while (j < k) {
int c = ii[hh[j]] != ii[h] ? ii[hh[j]] - ii[h] : jj[h] - jj[hh[j]];
if (c == 0)
j++;
else if (c < 0) {
tmp = hh[i], hh[i] = hh[j], hh[j] = tmp;
i++, j++;
} else {
k--;
tmp = hh[j], hh[j] = hh[k], hh[k] = tmp;
}
}
sort(hh, l, i);
l = k;
}
}
int main() {
static char cc[N + 1];
static int hh[N];
int n, h, i, cnt;
scanf("%*d%d%s", &n, cc);
for (i = 0; i < n; i++)
cc[i] -= '0';
for (i = 1; i < n; i++)
cc[i] ^= cc[i - 1];
if (cc[n - 1] != 0) {
printf("neispravno bojenje\n");
return 0;
}
for (h = 0; h < n - 3; h++) {
int c, tmp;
scanf("%d%d%d", &ii[h], &jj[h], &c), ii[h]--, jj[h]--;
if (ii[h] > jj[h])
tmp = ii[h], ii[h] = jj[h], jj[h] = tmp;
if ((cc[jj[h] - 1] ^ (ii[h] == 0 ? 0 : cc[ii[h] - 1])) != c) {
printf("neispravno bojenje\n");
return 0;
}
hh[h] = h;
}
sort(hh, 0, n - 3);
cnt = 0;
for (h = 0; h < n - 3; h++) {
int h_ = hh[h];
while (cnt && jj[hh[cnt - 1]] <= ii[h_])
cnt--;
if (cnt && (jj[h_] > jj[hh[cnt - 1]] || ii[h_] == ii[hh[cnt - 1]] && jj[h_] == jj[hh[cnt - 1]])) {
printf("neispravna triangulacija\n");
return 0;
}
hh[cnt++] = h_;
}
printf("tocno\n");
return 0;
}
Compilation message (stderr)
checker.c: In function 'main':
checker.c:68:69: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
68 | if (cnt && (jj[h_] > jj[hh[cnt - 1]] || ii[h_] == ii[hh[cnt - 1]] && jj[h_] == jj[hh[cnt - 1]])) {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
checker.c:40:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
40 | scanf("%*d%d%s", &n, cc);
| ^~~~~~~~~~~~~~~~~~~~~~~~
checker.c:52:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
52 | scanf("%d%d%d", &ii[h], &jj[h], &c), ii[h]--, jj[h]--;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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