Submission #1310323

#	Time	Username	Problem	Language	Result	Execution time	Memory
1310323		_Temirhan	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	264 ms	151080 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>  
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

#if defined(__GNUC__) || defined(__clang__)
#pragma GCC optimize("Ofast,unroll-loops,inline-functions,no-stack-protector,03")
#pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
#pragma clang loop vectorize(enable)
#pragma clang loop interleave(enable)
#endif

#define int long long
#define sz(x) (int)x.size()
#define F first
#define S second
#define pb push_back
#define nl '\n'
#define o_set tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update>
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef pair<int, int> pii;

void file( string s = "" )
{
    if( s.empty() )
        return;
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int N = 2e5 + 2;
const int N1 = 1e6 + 2;
const int inf = 1e9 + 2;
const int INF = 1e18 + 2;
const int mod = 1e9 + 7;
int T = 1, cnti[3001][3001], cnto[3001][3001];

void solve()
{
    int n, m;
    cin >>n >>m;
    string s[n];
    for( int i = 0; i < n; ++i )
        cin >>s[i];
    for( int j = 0; j < m; ++j )
    {
        int cnt = 0;
        for( int i = n - 1; i >= 0; --i )
        {
            if( s[i][j] == 'I' )
                ++cnt;
            if( s[i][j] == 'J' )
                cnti[i][j] = cnt;
        }
    }
    for( int i = 0; i < n; ++i )
    {
        int cnt = 0;
        for( int j = m - 1; j >= 0; --j )
        {
            if( s[i][j] == 'O' )
                ++cnt;
            if( s[i][j] == 'J' )
                cnto[i][j] = cnt;
        }
    }
    int ans = 0;
    for( int i = 0; i < n; ++i )
        for( int j = 0; j < m; ++j )
            ans += cnti[i][j] * cnto[i][j];
    cout <<ans;
}

signed main()
{
    file("");
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    // cin >>T;
    while( T-- )
        solve();
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'void file(std::string)':
joi2019_ho_t1.cpp:29:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50