이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
/*
https://oj.uz/problem/view/JOI18_bitaro
Bitaro's Party
*/
#include <bits/stdc++.h>
using namespace std;
using LL = long long;
const int N = 100000, B = 300, Q = 100000;
vector<int> gr[N];
pair<int, int> pp[N][B];
void join(pair<int, int> *aa, pair<int, int> *bb, pair<int, int> *cc) {
int i = 0, j = 0;
for (int k = 0; k < B; k++) {
if (i == B)
cc[k] = bb[j++];
else if (j == B)
cc[k] = aa[i++];
else if (aa[i].first > bb[j].first + 1)
cc[k] = aa[i++];
else
cc[k] = bb[j++];
}
}
void run() {
int n, m, q;
scanf("%d%d%d", &n, &m, &q);
while (m--) {
int i, j;
scanf("%d%d", &i, &j), i--, j--;
gr[j].push_back(i);
}
for (int i = 0; i < n; i++) {
static pair<int, int> tmp[B];
for (int j = 0; j < B; j++)
pp[i][j] = { -N, -1};
pp[i][0] = {0, i};
for (int j : gr[i]) {
join(pp[i], pp[j], tmp);
for (int k = 0; k < B; k++)
pp[i][k] = tmp[k];
}
}
for (int h = 1; h <= q; h++) {
static int removed[N];
int i, k, ans = -1;
scanf("%d%d", &i, &k), i--;
for (int _ = 0; _ < k; _++) {
int j;
scanf("%d", &j), j--;
removed[j] = h;
}
if (k < B) {
for (int _ = 0; _ < B; _++) {
auto [d, j] = pp[i][_];
if (removed[j] != h)
ans = max(ans, d);
}
} else {
static int dd[N];
priority_queue<pair<int, int>> pq;
memset(dd, -1, n * sizeof * dd);
pq.push({dd[i] = 0, i});
while (!pq.empty()) {
auto [d, i] = pq.top();
if (dd[i] != d)
continue;
if (removed[i] != h)
ans = max(ans, d);
for (int j : gr[i])
if (d + 1 > dd[j])
pq.push({dd[j] = d + 1, j});
}
}
printf("%d\n", ans);
}
}
int main() {
run();
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
bitaro.cpp: In function 'void run()':
bitaro.cpp:32:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
32 | scanf("%d%d%d", &n, &m, &q);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:36:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
36 | scanf("%d%d", &i, &j), i--, j--;
| ~~~~~^~~~~~~~~~~~~~~~
bitaro.cpp:55:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
55 | scanf("%d%d", &i, &k), i--;
| ~~~~~^~~~~~~~~~~~~~~~
bitaro.cpp:59:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
59 | scanf("%d", &j), j--;
| ~~~~~^~~~~~~~~~
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