| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 761754 | Dan4Life | Aliens (IOI16_aliens) | C++17 | 0 ms | 0 KiB |
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 "aliens.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
using ll = long long;
using ar = array<int,2>;
vector<ar> v,w;
ll sq(int i, int j){
int x = (i==0?0:v[i][0]-v[j][1]+1);
return 1ll*(v[j][0]-v[i][1]+1)*(v[j][0]-v[i][1]+1)-x*(x+1)/2;
}
ll take_photos(int n, int m, int k, vector<int> r, vector<int> c) {
for(int i = 0; i < n; i++)
if(r[i]>c[i]) r[i]=m-r[i]-1,c[i]=m-c[i]-1;
for(int i = 0; i < n; i++) w.pb({c[i],r[i]});
sort(begin(w),end(w),[&](ar a, ar b){
if(a[0]!=b[0]) return a[0]<b[0];
return a[1]>b[1];
});
int mn=m;
for(int i = n-1; i >=0; i--){
if(mn>w[i][1]) v.pb(w[i]);
mn = min(mn,w[i][1]);
}
n = sz(v); ll dp[k+1][n+1], ans = (ll)4e18;
memset(dp,63,sizeof(dp)); sort(begin(v),end(v));
for(int i = 1; i <= n; i++) dp[1][i] = sq(0,i-1);
for(int j = 2; j <= k; j++)
for(int i = 1; i <= n; i++)
for(int x = 1; x < i; x++)
dp[j][i] = min(dp[j][i], dp[j-1][x]+sq(x,i-1));
for(int i = 1; i <= k; i++) ans = min(ans, dp[i][n]);
return ans;
}
int main(){
int n, m, k;
assert(3 == scanf("%d %d %d", &n, &m, &k));
vector<int> r(n), c(n);
for (int i = 0; i < n; i++)
assert(2 == scanf("%d %d", &r[i], &c[i]));
printf("%lld\n", take_photos(n, m, k, r, c));
return 0;
}