이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin() , (x).end()
const int MAXN = 1e6 + 10;
int n , h , w , A[2][MAXN] , first[2][MAXN] , mn[2] , mx[2];
vector<int> vec[2][MAXN];
void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
h = H; w = W; n = h * w;
for(int i = 0 ; i < n ; i++){
A[0][i] = R[i];
A[1][i] = C[i];
vec[0][A[0][i]].push_back(i);
vec[1][A[1][i]].push_back(i);
}
for(int i = 0 ; i < h ; i++) first[0][i] = *min_element(all(vec[0][i]));
for(int i = 0 ; i < w ; i++) first[1][i] = *min_element(all(vec[1][i]));
}
void change(int i , int x , int a , int b){
for(int j = 0 ; j < vec[i][x].size() ; j++){
if(vec[i][x][j] == a) vec[i][x][j] = b;
}
first[i][x] = *min_element(all(vec[i][x]));
}
int swap_seats(int a, int b) {
if(a > b) swap(a , b);
int ans = 0;
for(int i = 0 ; i < 2 ; i++){
if(A[i][a] == A[i][b]) continue;
change(i , A[i][a] , a , b);
change(i , A[i][b] , b , a);
swap(A[i][a] , A[i][b]);
}
vector<int> vec;
for(int i = 0 ; i < h ; i++) vec.push_back(first[0][i]);
for(int i = 0 ; i < w ; i++) vec.push_back(first[1][i]);
sort(all(vec));
vec.resize(unique(all(vec)) - vec.begin());
vec.push_back(n);
mn[0] = mn[1] = MAXN;
mx[0] = mx[1] = -1;
for(int i = 0 ; i + 1 < vec.size() ; i++){
int pos = vec[i];
mn[0] = min(mn[0] , A[0][pos]); mx[0] = max(mx[0] , A[0][pos]);
mn[1] = min(mn[1] , A[1][pos]); mx[1] = max(mx[1] , A[1][pos]);
int x = (mx[0] - mn[0] + 1) , y = (mx[1] - mn[1] + 1);
if(vec[i] < x * y && x * y <= vec[i + 1]) ans++;
}
return ans;
}
컴파일 시 표준 에러 (stderr) 메시지
seats.cpp: In function 'void change(int, int, int, int)':
seats.cpp:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
25 | for(int j = 0 ; j < vec[i][x].size() ; j++){
| ~~^~~~~~~~~~~~~~~~~~
seats.cpp: In function 'int swap_seats(int, int)':
seats.cpp:48:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
48 | for(int i = 0 ; i + 1 < vec.size() ; i++){
| ~~~~~~^~~~~~~~~~~~
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