| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 549153 |
2022-04-15T10:27:08 Z |
kingfran1907 |
SIR (COI15_sir) |
C++14 |
|
148 ms |
6000 KB |
#include <bits/stdc++.h>
#define X first
#define Y second
using namespace std;
typedef long long llint;
const int maxn = 3e5+10;
const int base = 31337;
const int mod = 1e9+7;
const int inf = 0x3f3f3f3f;
const int logo = 20;
const int off = 1 << logo;
const int treesiz = off << 1;
int n, m;
pair<int, int> niz[maxn], ss[maxn];
vector< int > hul, hul2;
vector< pair<int, int> > hull;
bool bio[maxn];
llint ccw(pair<int, int> a, pair<int, int> b, pair<int, int> c) {
return (llint)a.X * (b.Y - c.Y) + (llint)b.X * (c.Y - a.Y) + (llint)c.X * (a.Y - b.Y);
}
int main() {
scanf("%d", &n);
for (int i = 0; i < n; i++) {
int x, y;
scanf("%d%d", &x, &y);
niz[i] = {x, y};
}
scanf("%d", &m);
for (int i = 0; i < m; i++) {
int x, y;
scanf("%d%d", &x, &y);
ss[i] = {x, y};
}
sort(ss, ss + m);
for (int i = 0; i < m; i++) {
while (hul.size() >= 2 && ccw(ss[hul[hul.size() - 2]], ss[hul.back()], ss[i]) >= 0)
hul.pop_back();
hul.push_back(i);
}
//printf("debug: \n");
//for (int i = 0; i < hul.size(); i++) {
// printf("%d %d\n", ss[hul[i]].X, ss[hul[i]].Y);
//}
reverse(ss, ss + m);
for (int i = 0; i < m; i++) {
while (hul2.size() >= 2 && ccw(ss[hul2[hul2.size() - 2]], ss[hul2.back()], ss[i]) >= 0)
hul2.pop_back();
hul2.push_back(i);
}
//printf("debug: \n");
//for (int i = 0; i < hul2.size(); i++) {
// printf("%d %d\n", ss[hul2[i]].X, ss[hul2[i]].Y);
//}
reverse(hul2.begin(), hul2.end());
reverse(ss, ss + m);
for (int tren : hul2) hul.push_back(m - 1 - tren);
memset(bio, false, sizeof bio);
for (int i = 0; i < hul.size(); i++) {
if (!bio[hul[i]]) hull.push_back(ss[hul[i]]);
bio[hul[i]] = true;
}
reverse(hull.begin(), hull.end());
int ptrh = 0;
int siz = hull.size();
for (int i = 0; i < siz; i++) {
if (ccw(niz[0], hull[ptrh], hull[i]) < 0) ptrh = i;
}
llint sol = 0;
int ptr = 0;
llint tren = 0;
for (int i = 0; i < n; i++) {
while (ccw(niz[i], hull[ptrh], hull[(ptrh + 1) % siz]) < 0) {
ptrh++;
if (ptrh == siz) ptrh = 0;
}
while (true) {
tren += abs(ccw(niz[i], niz[ptr], niz[(ptr + 1) % n]));
bool flag = ccw(niz[i], hull[ptrh], niz[(ptr + 1) % n]) < 0;
//if (flag) printf("%d --> %d (%lld)\n", i, ptr, tren);
if (flag) sol = max(sol, tren), ptr++, ptr %= n;
else {
tren -= abs(ccw(niz[i], niz[ptr], niz[(ptr + 1) % n]));
break;
}
}
tren -= abs(ccw(niz[i], niz[(i + 1) % n], niz[ptr]));
}
printf("%lld\n", sol);
return 0;
}
Compilation message
sir.cpp: In function 'int main()':
sir.cpp:69:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
69 | for (int i = 0; i < hul.size(); i++) {
| ~~^~~~~~~~~~~~
sir.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
27 | scanf("%d", &n);
| ~~~~~^~~~~~~~~~
sir.cpp:30:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
30 | scanf("%d%d", &x, &y);
| ~~~~~^~~~~~~~~~~~~~~~
sir.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
34 | scanf("%d", &m);
| ~~~~~^~~~~~~~~~
sir.cpp:37:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
37 | scanf("%d%d", &x, &y);
| ~~~~~^~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
596 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
596 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
148 ms |
6000 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
