Submission #1126645

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126645		SoMotThanhXuan	Cover (COCI18_cover)	C++20	120 / 120	16 ms	396 KiB

cover

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, a, b) for(int i = (a), _b = (b); i <= _b; ++i)
#define REP(i, a, b) for(int i = (a), _b = (b); i >= _b; --i)
#define mp make_pair
#define all(v) v.begin(), v.end()
#define uni(v) v.erase(unique(all(v)), v.end())
inline bool maximize(int &u, int v){
    if(v > u){
        u = v;
        return true;
    }
    return false;
}
inline bool minimize(int &u, int v){
    if(v < u){
        u = v;
        return true;
    }
    return false;
}
inline bool maximizell(long long &u, long long v){
    if(v > u){
        u = v;
        return true;
    }
    return false;
}
inline bool minimizell(long long &u, long long v){
    if(v < u){
        u = v;
        return true;
    }
    return false;
}
const int mod = 1e9 + 7;
inline int fastPow(int a, int n){
    int res = 1;
    while(n){
        if(n & 1)res = 1ll * res * a * mod;
        a = 1ll * a * a % mod;
        n >>= 1;
    }
    return res;
}
inline void add(int &u, int v){
    u += v;
    if(u >= mod) u -= mod;
}
inline void sub(int &u, int v){
    u -= v;
    if(u < 0) u += mod;
}
const int maxN = 5e3 + 5;
const int inf = 2e9;
const long long infll = 1e18;
pair<int, int> a[maxN];
long long f[maxN];
int n;
void process(){
    cin >> n;
    FOR(i, 1, n){
        cin >> a[i].first >> a[i].second;
        a[i].first = abs(a[i].first);
        a[i].second = abs(a[i].second);
    }
    sort(a + 1, a + 1 + n);
    f[1] = 1ll * a[1].first * a[1].second;
    FOR(i, 2, n){
        int Y = a[i].second;
        f[i] = infll;
        REP(j, i, 1){
            maximize(Y, a[j].second);
            minimizell(f[i], f[j - 1] + 1ll * Y * a[i].first);
        }
    }
    cout << (f[n] << 2);
}
#define NAME ""
int main(){
    if(fopen(NAME".inp", "r")){
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
//    cin >> t;
    while(t--)
        process();
//    cerr << '\n' << "Time elapsed: " << (1.0 * clock() / CLOCKS_PER_SEC) << " s\n" ;
    return 0;
}

Compilation message (stderr)

cover.cpp: In function 'int main()':
cover.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
cover.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 120 / 120