Submission #723967

#	Time	Username	Problem	Language	Result	Execution time	Memory
723967		PoPularPlusPlus	Red-blue table (IZhO19_stones)	C++17	100 / 100	37 ms	10060 KiB

stones

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long 
#define pb(e) push_back(e)
#define sv(a) sort(a.begin(),a.end())
#define sa(a,n) sort(a,a+n)
#define mp(a,b) make_pair(a,b)
#define vf first
#define vs second
#define ar array
#define all(x) x.begin(),x.end()
const int inf = 0x3f3f3f3f;
const int mod = 1000000007; 
const double PI=3.14159265358979323846264338327950288419716939937510582097494459230;

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

bool remender(ll a , ll b){return a%b;}

//freopen("problemname.in", "r", stdin);
//freopen("problemname.out", "w", stdout);

void solve(){
	int n , m;
	cin >> n >> m;
	int dp[n+1][m+1],dp1[m+1][n+1];
	int mnn = m/2 + 1,mnm = n/2 + 1;
	int ans = 0;
	array<int,3> pos;
	for(int i = 0; i <= n; i++){
		for(int j = 0; j <= mnn; j++){
			dp[i][j] = i;
			if(i <= n-mnm)dp[i][j] += j;
			int rem = m - j;
			if(rem){
			int total = i*mnn-j*i;
			int less = total / rem;
			int some = total % rem;
			if(less+1 <= n-mnm)dp[i][j] += some;
			if(less <= n-mnm)dp[i][j] += rem - some;
			}
			if(dp[i][j] > ans){
				ans = dp[i][j];
				pos = {0,i,j};
			}
		}
	}
	for(int i = 0; i <= m; i++){
		for(int j = 0; j <= mnm; j++){
			dp1[i][j] = i;
			if(i <= m-mnn)dp1[i][j] += j;
			int rem = n - j;
			if(rem){
			int total = i*mnm-i*j;
			int less = total / rem;
			int some = total % rem;
			if(less+1 <= m-mnn)dp1[i][j] += some;
			if(less <= m-mnn)dp1[i][j] += rem - some;
			}
			if(dp1[i][j] > ans){
				ans = dp1[i][j];
				pos = {1,i,j};
			}
		}
	}
	cout << ans << '\n';
	char res[n][m];
	if(pos[0] == 0){
		for(int i = 0; i < n; i++){
			for(int j = 0; j < m; j++){
				res[i][j] = '-';
			}
		}
		for(int i = 0; i < pos[1]; i++){
			for(int j = 0; j < pos[2]; j++){
				res[i][j] = '+';
			}
		}
		int left = pos[2] , cur = left;
		for(int i = 0; i < pos[1]; i++){
			int cnt = 0;
			while(cnt < mnn-pos[2]){
				cnt++;
				res[i][cur] = '+';
				cur++;
				if(cur == m)cur = left;
			}
		}
		for(int i = 0; i < n; i++){
			for(int j = 0; j < m; j++)cout << res[i][j];
			cout << '\n';
		}
	}
}

int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
    int t;cin>>t;
    while(t--){
		solve();
	}
	return 0;
}

Compilation message (stderr)

stones.cpp: In function 'void solve()':
stones.cpp:77:15: warning: 'pos.std::array<int, 3>::_M_elems[2]' may be used uninitialized in this function [-Wmaybe-uninitialized]
   77 |     res[i][j] = '+';
      |     ~~~~~~~~~~^~~~~
stones.cpp:75:20: warning: 'pos.std::array<int, 3>::_M_elems[1]' may be used uninitialized in this function [-Wmaybe-uninitialized]
   75 |   for(int i = 0; i < pos[1]; i++){

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