Submission #919560

#	Time	Username	Problem	Language	Result	Execution time	Memory
919560		manizare	Red-blue table (IZhO19_stones)	C++14	17 / 100	38 ms	3408 KiB

stones

#include <bits/stdc++.h>
#pragma GCC optimize ("O3,unroll-loops")
#pragma GCC target("avx2") 
#define pb push_back
#define F first
#define S second 
#define all(a) a.begin(),a.end()
#define pii pair <int,int>
#define PII pair<pii , pii>
#define int long long 
#define sz(v) (int)v.size()
#define rep(i , a , b) for(int i=a;i <= (b);i++)
#define per(i , a , b) for(int i=a;i >= (b);i--)
#define deb(x) cout <<#x << " : " << x << "\n" ; 
using namespace std ;   
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxn = 1e6+ 10 , maxm = 1e6+10 , lg = 18 , inf= 1e18 , mod = 998244353 ;
int t[maxn] ;char A[maxn] ;

int f(int a ,int n){
    return max(0ll , (n+2)/2 - (n-a));
}

signed main(){
	ios_base::sync_with_stdio(false);cin.tie(0);
    int T ;
    cin >>  T ;
    while(T--){
        int n , m ;
        cin >> n >> m ;
        int mx = -1 , a , b ;
        rep(i , 0 , n){
            int l =0 , r = m+1 ;
            while(r-l>1){
                int mid = (l+r)/2 ;
                if(f(mid , m)*i+f(i , n)*mid > i*mid){
                    r = mid ;
                }else{
                    l = mid ;
                }
            }
            if(mx < l+i){
                a = i ;
                b = l ;
                mx = l+i ;
            }
        }
        cout << mx << "\n";
        rep(i , 1, b){
            t[i] = f(i , n) ;
        } 
        rep(i , 1 ,a){
            vector <pii> vec;
            rep(i , 1 , b){
                vec.pb({t[i] ,i}) ;
                A[i] = '+' ;
            }
            sort(all(vec)) ;
            int x = b-f(b , m) ;
            while(x--){
                A[vec.back().S] = '-' ;
                vec.pop_back() ;
            }
            rep(i , 1 ,b){
                cout << A[i] ;
            }
            rep(i , b+1 ,m ){
                cout << "+";
            }
            cout << "\n"; 
        }
        rep(i , a+1 , n){
            rep(j ,1 , m){
                cout << "-";
            }
            cout << "\n"; 
        }
    }
}
/*
    
*/

Compilation message (stderr)

stones.cpp: In function 'int main()':
stones.cpp:59:30: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   59 |             int x = b-f(b , m) ;
      |                              ^
stones.cpp:12:38: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
   12 | #define rep(i , a , b) for(int i=a;i <= (b);i++)
      |                                      ^~
stones.cpp:31:23: note: 'a' was declared here
   31 |         int mx = -1 , a , b ;
      |                       ^

• Subtask 1: 17 / 17
• Subtask 2: 0 / 10
• Subtask 3: 0 / 16
• Subtask 4: 0 / 11
• Subtask 5: 0 / 15
• Subtask 6: 0 / 31