Submission #254636

#	Time	Username	Problem	Language	Result	Execution time	Memory
254636		Nucleist	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	902 ms	88696 KiB

joi2019_ho_t1

//Self-control leads to consistency.
#include <bits/stdc++.h> 
using namespace std; 
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#define flash ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define debug(x) cerr << " - " << #x << ": " << x << endl;
#define debugs(x, y) cerr << " - " << #x << ": " << x << " " << #y << ": " << y << endl;
#define all(x) (x).begin(),(x).end()
#define sz(x) (ll)x.size()
#define ll long long
#define INF 1000000000
#define MOD 1000000007
#define pb push_back
#define ve vector<ll>
#define dos pair<ll,ll>
#define vedos vector<dos>
#define rand mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define EPS 0.000001
struct greateri
{
    template<class T>
    bool operator()(T const &a, T const &b) const { return a > b; }
};
void setIO(string s) {
  ios_base::sync_with_stdio(0); cin.tie(0); 
  freopen((s+".in").c_str(),"r",stdin);
  freopen((s+".out").c_str(),"w",stdout);
}
char tab[3001][3001];
int cum1[3001][3001],cum2[3001][3001];
int main()
{
  //flash;
  int n,m;
  cin>>n>>m;
  for (int i = 0; i < n; ++i)
  {
    for (int j = 0; j < m; ++j)
    {
      cin>>tab[i][j];
      if(tab[i][j]=='O')cum1[i][j]++;
      if(tab[i][j]=='I')cum2[i][j]++;
    }
  }
  for (int i = 0; i < n; ++i)
  {
    for (int j = 0; j < m; ++j)
    {
      if(j)cum1[i][j]+=cum1[i][j-1];
      if(i)cum2[i][j]+=cum2[i-1][j];
    }
  }
  ll ans=0;
  for (int i = 0; i < n; ++i)
  {
    for (int j = 0; j < m; ++j)
    {
      if(tab[i][j]=='J'){
        ans+=(cum1[i][m-1]-cum1[i][j])*(cum2[n-1][j]-cum2[i][j]);
      }
    }
  }
  cout<<ans;
  return 0;
}

Compilation message (stderr)

joi2019_ho_t1.cpp:5:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("O3")
 
joi2019_ho_t1.cpp:6:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("unroll-loops")
 
joi2019_ho_t1.cpp: In function 'void setIO(std::__cxx11::string)':
joi2019_ho_t1.cpp:28:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen((s+".in").c_str(),"r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:29:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen((s+".out").c_str(),"w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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