Submission #698479

#	Time	Username	Problem	Language	Result	Execution time	Memory
698479		Do_you_copy	3D Histogram (COCI20_histogram)	C++17	20 / 110	17 ms	3468 KiB

histogram

//Then
#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define faster ios_base::sync_with_stdio(0); cin.tie(0);

using namespace std;
using ll = long long;
using ld = long double;
using pii = pair <int, int>;
mt19937_64 Rand(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e5 + 1;
//const int Mod = 1e9 + 7;
const int inf = 0x3f3f3f3f;
int n;
pii a[maxN];

void Sub1(){
    ll ans = 0;
    for (int i = 1; i <= n; ++i){
        int min1 = inf;
        int min2 = inf;
        for (int j = i; j <= n; ++j){
            min1 = min(min1, a[j].fi);
            min2 = min(min2, a[j].se);
            ans = max(ans, 1LL * (j - i + 1) * min1 * min2);
        }
    }
    cout << ans;
}

void Init(){
    cin >> n;
    for (int i = 1; i <= n; ++i) cin >> a[i].fi >> a[i].se;
    if (n <= 2000) Sub1();
}

#define debug
#define taskname "histogram"
signed main(){
    faster
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    int tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000);
        timeout.close();
        #ifndef debug
        cerr << "Time elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n";
        #endif // debug
    }
}

Compilation message (stderr)

histogram.cpp: In function 'int main()':
histogram.cpp:45:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
histogram.cpp:46:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 90