#include "bits/stdc++.h"
using namespace std;
#define ar array
signed main(){
ios::sync_with_stdio(0); cin.tie(0);
int R, C; cin>>R>>C;
int n; cin>>n;
vector<int> x(n), y(n);
for(int i=0;i<n;i++){
cin>>x[i]>>y[i];
}
int res = R + C;
auto check = [&](int a){
vector<ar<int, 2>> s;
for(int i=0;i<n;i++){
s.push_back({x[i], y[i]});
s.push_back({x[i] + a + 1, -y[i]});
}
multiset<int> ss, bet;
sort(s.begin(), s.end());
//~ for(auto x : s) cout<<x[0]<<" "<<x[1]<<endl;
//~ cout<<endl;
int m = s.size();
vector<ar<int, 4>> tot;
//~ cout<<"here"<<endl;
for(int i=0;i<m;){
int j = i;
while(j<m && s[j][0] == s[i][0]){
if(s[j][1] > 0){
auto rx = ss.lower_bound(s[j][1]);
auto lx = rx;
if(lx != ss.begin() && rx != ss.end()){
lx--;
bet.erase(bet.find(*rx - *lx - 1));
lx++;
}
if(rx != ss.end()){
bet.insert(*rx - s[j][1] - 1);
} if(lx != ss.begin()){
lx--;
bet.insert(s[j][1] - *lx - 1);
lx++;
}
ss.insert(s[j][1]);
} else {
s[j][1] *= -1;
ss.erase(ss.find(s[j][1]));
auto rx = ss.lower_bound(s[j][1]);
auto lx = rx;
if(rx != ss.end()){
bet.erase(bet.find(*rx - s[j][1] - 1));
} if(lx != ss.begin()){ lx--;
bet.erase(bet.find(s[j][1] - *lx - 1));
lx++;
}
if(lx != ss.begin() && rx != ss.end()){
lx--;
bet.insert(*rx - *lx - 1);
lx++;
}
}
j++;
}
//~ int t = 0;
//~ if(j < m){
//~ if((s[i][1] > 0) && (s[j][1] < 0)) t = 1;
//~ if((s[i][1] < 0) && (s[j][1] > 0)) t = -1;
//~ }
int left = 0, right = 0, l_r = 0;
if(!ss.empty()) left = *ss.begin() - 1;
if(!ss.empty()) right = C - *--ss.end();
if(!bet.empty()) l_r = *--bet.end();
//~ for(auto x : ss) cout<<x<<" ";
//~ cout<<endl;
//~ for(auto x : bet) cout<<x<<" ";
//~ cout<<endl;
//~ cout<<s[i][0]<<" "<<left<<" "<<right<<" "<<l_r<<endl;
tot.push_back({s[i][0], left, right, l_r});
i = j;
}
//~ for(auto x : tot){
//~ cout<<x[0]<<" "<<x[1]<<" "<<x[2]<<" "<<x[3]<<" "<<x[4]<<"\n";
//~ }
int r = 0, mn = C;
//~ m = tot.size();
//~ for(int i=0;i<m;i++){
//~ int A = 0, B = 0, C = 0, cc = 0;
//~ for(int j=i+1;j<m;j++){
//~ A = max(A, tot[j-1][1]);
//~ B = max(B, tot[j-1][2]);
//~ C = max(C, tot[j-1][3]);
//~ cc += tot[j-1][4];
//~ if(tot[j][0] - tot[i][0] >= R){
//~ res = min(res, a + max(A + B, C));
//~ } else if(cc * add >= R - (tot[j][0] - tot[i][0])){
//~ res = min(res, a + max(A + B, C) + (R - (tot[j][0] - tot[i][0]) + cc - 1) / cc);
//~ }
//~ if(add) assert(cc < 2);
//~ }
//~ }
multiset<int> A, B, C;
for(int l=0;l<m;l++){
while(r<m && tot[r][0] - tot[l][0] < R){
A.insert(tot[r][1]);
B.insert(tot[r][2]);
C.insert(tot[r][3]);
r++;
} if(r == m) break;
mn = min(mn, max(*--A.end() + *--B.end(), *--C.end()));
A.erase(A.find(tot[l][1]));
B.erase(B.find(tot[l][2]));
C.erase(C.find(tot[l][3]));
}
res = min(res, a + mn);
};
for(int a=0;a<R;a++){
check(a);
}
cout<<res<<"\n";
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
2079 ms |
212 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Execution timed out |
2079 ms |
212 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
