Submission #1307763

#	Time	Username	Problem	Language	Result	Execution time	Memory
1307763		ng.annhaat	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	168 ms	150260 KiB

joi2019_ho_t1

/*
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*/
//#include <bits/BaoMinhTranc++.h>
#include <bits/stdc++.h>
#define int int64_t
//#define ll int64_t
#define ld long double
#define ii pair<int,int>
#define iii pair<int,ii>
#define fi first
#define se second
#define ALL(x) x.begin(),x.end()
#define ALLr(x) x.rbegin(),x.rend()
#define upgrade ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define name "youreagoodmanarthur"
using namespace std;
const int Max=1<<20;
const int N=3e3+3;
const int INF=1e18;
const int MOD=998244353;
const int MOD2=1e9+8;
const int base=26;
const int LOG=32;
template<class X,class Y>
    bool minimize(X& x,const Y& y)
    {
        if(x>y){
            x=y;
            return 1;
        }return 0;
    }
template<class X,class Y>
    bool maximize(X& x,const Y& y)
    {
        if(x<y){
            x=y;
            return 1;
        }return 0;
    }
int n,m;
char a[N][N];
int O[N][N],I[N][N];
void solve()
{
    cin>>n>>m;
    for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)cin>>a[i][j];
    for(int i=1;i<=n;i++)for(int j=m;j>=1;j--)O[i][j]=O[i][j+1]+(a[i][j]=='O');
    for(int i=n;i>=1;i--)for(int j=1;j<=m;j++)I[i][j]=I[i+1][j]+(a[i][j]=='I');
    int ans=0;
    for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)if(a[i][j]=='J')ans+=O[i][j]*I[i][j];
    cout<<ans;
}
void prepare()
{

}
signed main()
{
    upgrade
    if(fopen(name".INP","r")){
        freopen(name".INP","r",stdin);
        freopen(name".OUT","w",stdout);
    }
    prepare();
    int test=1;
//    cin>>test;
    while(test--)solve();
    return 0;
}
/*

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*/

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(name".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(name".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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