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 <bits/stdc++.h>
void Solve(int N);
int Query(int x);
void Answer(int x, int y);
bool solved[200005];
void Solve(int N) {
for (int i = 1; i <= 2 * N; i++) {
if (solved[i]) continue;
Query(i);
for (int j = i+1; j <= 2 * N; j++) {
int res = Query(j);
Query(j);
if (res == 1) {
Answer(i, j);
solved[i] = solved[j] = true;
break;
}
}
Query(i);
}
}
#ifdef LOCAL_TEST
#include <cstdio>
#include <cstdlib>
#include <algorithm>
constexpr int MAX_N = 43000;
constexpr int MAX_CALLS = 1000000;
namespace {
void WrongAnswer(int code) {
printf("Wrong Answer [%d]\n", code);
exit(0);
}
int N;
int counterpart[2 * MAX_N + 1];
int num_queries;
int num_kinds;
int on[2 * MAX_N + 1];
int count[2 * MAX_N + 1];
int num_answers;
int answer[2 * MAX_N + 1];
} // namespace
int Query(int x) {
if (!(1 <= x && x <= 2 * N)) {
WrongAnswer(1);
}
if (++num_queries > MAX_CALLS) {
WrongAnswer(2);
}
const int type = std::min(x, counterpart[x]);
if (on[x]) {
--on[x];
--count[type];
if (count[type] == 0) {
--num_kinds;
}
} else {
++on[x];
++count[type];
if (count[type] == 1) {
++num_kinds;
}
}
return num_kinds;
}
void Answer(int a, int b) {
std::cout << "Answer(" << a << ", " << b << ")" << std::endl;
if (++num_answers > N) {
WrongAnswer(6);
}
if (!(1 <= a && a <= 2 * N && 1 <= b && b <= 2 * N)) {
WrongAnswer(3);
}
if (answer[a] != 0) {
WrongAnswer(4);
}
answer[a] = b;
if (answer[b] != 0) {
WrongAnswer(4);
}
answer[b] = a;
if (!(counterpart[a] == b && counterpart[b] == a)) {
WrongAnswer(5);
}
}
int main() {
if (scanf("%d", &N) != 1) {
fprintf(stderr, "Error while reading input\n");
exit(1);
}
for (int i = 1; i <= N; ++i) {
int x, y;
if (scanf("%d%d", &x, &y) != 2) {
fprintf(stderr, "Error while reading input\n");
exit(1);
}
counterpart[x] = y;
counterpart[y] = x;
}
Solve(N);
if (num_answers != N) {
WrongAnswer(6);
}
printf("Accepted: %d\n", num_queries);
return 0;
}
#endif
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