Submission #496901

#	Time	Username	Problem	Language	Result	Execution time	Memory
496901		kingline	Maxcomp (info1cup18_maxcomp)	C++17	30 / 100	1086 ms	33864 KiB

maxcomp

/*#pragma GCC optimize("O3")
#pragma GCC target ("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")*/
#include <bits/stdc++.h>
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
//#define file(data) freopen(data".in", "r", stdin); freopen(data".out", "w", stdout);
#define pb push_back
//#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define all(data) data.begin() , data.end()
#define endl '\n'
//freopen("nenokku_easy.in", "r", stdin);
//freopen("nenokku_easy.out", "w", stdout);
#define int long long
#define pii pair < int, int >
#define pll pair < long long, long long >

using namespace std;

const int N = 1e3 + 5;
const int lg = 21;

int n, m, a[N][N], ans = -1, used[N][N];

multiset < int > st;
vector < pii > path;
void rec(int i, int j, int len) {
    if(i > n || j > m || j < 1 || i < 1) return;
    ans = max(ans, (*st.rbegin()) - (*st.begin()) - len);
    if(!used[i + 1][j]) {
        path.pb({i + 1, j});
        st.insert(a[i + 1][j]);
        used[i + 1][j] = 1;
        rec(i + 1, j, len + 1);
        st.erase(st.find(a[i + 1][j]));
    }
    if(!used[i][j + 1]) {
        path.pb({i, j + 1});
        used[i][j + 1] = 1;
        st.insert(a[i][j + 1]);
        rec(i, j + 1, len + 1);
        st.erase(st.find(a[i][j + 1]));
    }
    if(!used[i][j - 1]) {
        path.pb({i, j - 1});
        used[i][j - 1] = 1;
        st.insert(a[i][j - 1]);
        rec(i, j - 1, len + 1);
        st.erase(st.find(a[i][j - 1]));
    }
}

void rec1(int i, int j, int len) {
    if(i > n || j > m) return;
    ans = max(ans, (*st.rbegin()) - (*st.begin()) - len);
    st.insert(a[i + 1][j]);
    rec1(i + 1, j, len + 1);
    st.erase(st.find(a[i + 1][j]));
    st.insert(a[i][j + 1]);
    rec1(i, j + 1, len + 1);
    st.erase(st.find(a[i][j + 1]));
}

main() {
    //file("pieaters");
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= m; j++) {
            cin >> a[i][j];
        }
    }
    if(n != 1) {
        for(int i = 1; i <= n; i++) {
            for(int j = 1; j <= m; j++) {
                used[i][j] = 1;
                st.insert(a[i][j]);
                rec(i, j, 1);
                st.erase(st.find(a[i][j]));
                used[i][j] = 0;
                for(int k = 0; k < path.size(); k++) {
                    used[path[k].first][path[k].second] = 0;
                }
            }
        }
    } else {
        for(int i = 1; i <= n; i++) {
            for(int j = 1; j <= m; j++) {
                st.insert(a[i][j]);
                rec1(i, j, 1);
                st.erase(st.find(a[i][j]));
            }
        }
    }
    cout << ans;
}

Compilation message (stderr)

maxcomp.cpp:66:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   66 | main() {
      | ^~~~
maxcomp.cpp: In function 'int main()':
maxcomp.cpp:85:34: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |                 for(int k = 0; k < path.size(); k++) {
      |                                ~~^~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40