Submission #530484

#	Time	Username	Problem	Language	Result	Execution time	Memory
530484		aSSSd	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	201 ms	88636 KiB

joi2019_ho_t1

//#pragma GCC optimize("O2,unroll-loops")
//#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
using namespace std;
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r)
{
    return l+rng()%(r-l+1);
}
#define fasty ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define forinc(x,a,b) for(int x=a;x<=b;x++)
#define fordec(x,a,b) for(int x=a;x>=b;x--)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<long long,long long>
#define getbit(x,i) ((x>>(i))&1)
#define batbit(x,i) (x|(1ll<<(i)))
#define tatbit(x,i) (x&~(1<<(i)))
#define gg exit(0);
#define all(a) a.begin() , a.end()
const int N = 3010;
char a[N][N];
int m , n;
int cntO[N][N];
int cntI[N][N];
main()
{
    fasty;
    cin >> m >> n;
    forinc(i,1,m) forinc(j,1,n) cin >> a[i][j];
    long long tot=0;
    forinc(i,1,m) fordec(j,n,1)
    {
       if(a[i][j] == 'O') cntO[i][j] = cntO[i][j+1] + 1;
       else cntO[i][j] = cntO[i][j+1];
    }
    fordec(i,m,1) forinc(j,1,n)
    {
      if(a[i][j] == 'I')  cntI[i][j] = cntI[i+1][j] + 1;
      else cntI[i][j] = cntI[i+1][j];
    }
    forinc(i,1,m) forinc(j,1,n) if(a[i][j] == 'J')
    {
        tot += cntI[i][j] * cntO[i][j];
    }
    cout << tot;

}

Compilation message (stderr)

joi2019_ho_t1.cpp:29:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   29 | main()
      | ^~~~

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