#include "aliens.h"
#include <vector>
#include <iostream>
#include <algorithm>
#include <cassert>
using namespace std;
#define ll long long
#define pb push_back
#define ii pair<int, int>
#define pl pair<ll, ll>
#define f1 first
#define s2 second
const int MAX = 1e5 + 7;
vector<ii> interval;
//cost for interval [i, j], assuming interval [0, i-1] have been fulfilled
inline ll getCost(int i, int j)
{
ll res = 1LL * (interval[j].s2 - interval[i].f1 + 1) * (interval[j].s2 - interval[i].f1 + 1);
if (i)
{
if (interval[i-1].s2 >= interval[i].f1)
res -= 1LL * (interval[i-1].s2 - interval[i].f1 + 1) * (interval[i-1].s2 - interval[i].f1 + 1);
}
return res;
}
ll dp[MAX];
int ctr[MAX];
pl check(int slope)
{
dp[0] = ctr[0] = 0;
dp[1] = min(0LL, getCost(0, 0) - slope);
ctr[1] = 1;
for (int i = 2; i <= interval.size(); ++i)
{
int l = 0, r = i-2;
while (l < r)
{
int mid = (l + r) / 2;
if (getCost(mid, i) >= slope) r = mid;
else l = mid + 1;
}
dp[i] = dp[l] + getCost(l+1, i-1) - slope;
ctr[i] = ctr[l] + 1;
}
return {ctr[interval.size()], dp[interval.size()]};
}
long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> c) {
vector<ii> v(n);
for (int i = 0; i < n; ++i)
v[i] = {min(r[i], c[i]), max(r[i], c[i])};
sort(v.begin(), v.end(), [](const ii &x, const ii &y){
return x.f1 < y.f1 || (x.f1 == y.f1 && x.s2 > y.s2);
});
interval.pb(v[0]);
for (int i = 1; i < n; ++i)
{
if (interval.back().f1 <= v[i].f1 && v[i].s2 <= interval.back().s2)
continue;
interval.pb(v[i]);
}
ll L = 0, R = 1e12;
for (int i = 0; i < interval.size(); ++i)
L = max(L, getCost(i, i));
k = min(k, (int)interval.size());
while (L < R)
{
ll mid = (L + R) / 2;
pl res = check(mid);
if (res.f1 <= k) R = mid;
else L = mid + 1;
}
pl res = check(L);
return k * L + res.s2;
}
int main() {
int n, m, k;
assert(3 == scanf("%d %d %d", &n, &m, &k));
std::vector<int> r(n), c(n);
for (int i = 0; i < n; i++) {
assert(2 == scanf("%d %d", &r[i], &c[i]));
}
long long ans = take_photos(n, m, k, r, c);
printf("%lld\n", ans);
return 0;
}
Compilation message
aliens.cpp: In function 'std::pair<long long int, long long int> check(int)':
aliens.cpp:41:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
41 | for (int i = 2; i <= interval.size(); ++i)
| ~~^~~~~~~~~~~~~~~~~~
aliens.cpp: In function 'long long int take_photos(int, int, int, std::vector<int>, std::vector<int>)':
aliens.cpp:74:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
74 | for (int i = 0; i < interval.size(); ++i)
| ~~^~~~~~~~~~~~~~~~~
/tmp/ccV6FzSl.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cc4fw530.o:aliens.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
