Submission #370304

#	Time	Username	Problem	Language	Result	Execution time	Memory
370304		AriaH	Raspad (COI17_raspad)	C++11	61 / 100	6049 ms	100844 KiB

raspad

/** Im the best because i work as hard as i possibly can **/
 
#pragma GCC optimize("O2")
#include <bits/stdc++.h>
using namespace std;
 
typedef long long                   ll;
typedef long double                 ld;
typedef pair<int,int>               pii;
typedef pair<ll,ll>                 pll;
#define all(x)                      (x).begin(),(x).end()
#define F                           first
#define S                           second
#define Mp                          make_pair
#define fast_io                     ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file_io                     freopen("in.txt" , "r+" , stdin) ; freopen("out.txt" , "w+" , stdout);
#define endl                        "\n"
#define SZ(x)						(int)x.size()
 
const int N = 1e5 + 10;
const ll mod = 1e9 + 7;
const ll mod2 = 998244353;
const ll inf = 8e18;
const int LOG = 22;
const int M = 52;
 
char C[N];
 
int n, m, A[N][M], I[N][M], par[N * M], arr[N][M], par2[N * M];
 
pii RI[N * M];
 
ll tot, ps[N], cnt[N];

/// unify tp = 0 for the left side  &   unify tp = 1 for right side     unify2 for the merge of left and right

inline int ok(int i) { return A[RI[i].F][RI[i].S]; }

int get2(int x) { return (x == par2[x]? x : par2[x] = get2(par2[x])); }

int get(int x) { return (x == par[x]? x : par[x] = get(par[x])); }

int unify(int v, int u, int tp)
{
	if(tp == 0)
	{
		if(v < u) swap(u, v);
	}
	else
	{
		if(u < v) swap(u, v);
	}
	if(!ok(v) || !ok(u)) return 0;
	v = get(v), u = get(u);
	if(v == u) return 0;
	par[u] = v;
	return 1;
}

int unify2(int v, int u)
{
	if(!ok(v) || !ok(u)) return 0;
	v = get2(v), u = get2(u);
	if(v == u) return 0;
	par2[u] = v;
	return 1;
}

ll jam(int l, int r, int tp, int mid)
{
	if(tp == 0)
	{
		r ++;
		return (l > mid? 0 : ps[l]) - (r > mid? 0 : ps[r]);
	}
	else
	{
		l --;
		return (r <= mid? 0 : ps[r]) - (l <= mid? 0 : ps[l]);
	}
}

inline void Reset(int x)  { par2[x] = x; }

void solve(int l, int r)
{
	if(l > r) return;
	if(l == r)
	{
		for(int j = 1; j <= m; j ++)
		{
			tot += A[l][j];
			tot -= (A[l][j] + A[l][j - 1] == 2);
		}
		return;
	}
	int mid = (l + r) >> 1;
	solve(l, mid); solve(mid + 1, r);
	cnt[l - 1] = cnt[r + 1] = ps[l - 1] = ps[r + 1] = 0;
	for(int i = l; i <= r; i ++)
	{
		ps[i] = cnt[i] = 0;
		for(int j = 1; j <= m; j ++)
		{
			par[I[i][j]] = I[i][j];
			arr[i][j] = 0;
		}
	}
	///printf("l = %d r = %d\n", l, r);
	vector < int > L, R;
	/// compressing the right side
	R.push_back(mid + 1);
	for(int i = mid + 1; i <= r; i ++)
	{
		for(int j = 1; j <= m; j ++)
		{
			cnt[i] += A[i][j];
			cnt[i] -= unify(I[i][j], I[i][j - 1], 1);
		}
		if(i > mid + 1)
		{
			cnt[i] += cnt[i - 1];
			for(int j = 1; j <= m; j ++)
			{
				cnt[i] -= unify(I[i][j], I[i - 1][j], 1);
			}
		}
		ps[i] = cnt[i];
		for(int j = 1; j <= m; j ++)
		{
			arr[i][j] = get(I[mid + 1][j]);
		}
		if(i > mid + 1)
		{
			ps[i] += ps[i - 1];
			int flag = 0;
			for(int j = 1; j <= m; j ++)
			{
				if(!A[mid + 1][j]) continue;
				if(arr[i][j] != arr[i - 1][j]) flag = 1;
			}
			if(flag) R.push_back(i);
		}
	}
	R.push_back(r + 1);
	/// end
	/// compressing the left side
	L.push_back(mid);
	for(int i = mid; i >= l; i --)
	{
		for(int j = 1; j <= m; j ++)
		{
			cnt[i] += A[i][j];
			cnt[i] -= unify(I[i][j], I[i][j - 1], 0);
		}
		if(i < mid)
		{
			cnt[i] += cnt[i + 1];
			for(int j = 1; j <= m; j ++)
			{
				cnt[i] -= unify(I[i][j], I[i + 1][j], 0);
			}
		}
		ps[i] = cnt[i];
		for(int j = 1; j <= m; j ++)
		{
			arr[i][j] = get(I[mid][j]);
		}
		if(i < mid)
		{
			ps[i] += ps[i + 1];
			int flag = 0;
			for(int j = 1; j <= m; j ++)
			{
				if(!A[mid][j]) continue;
				if(arr[i][j] != arr[i + 1][j]) flag = 1;
			}
			if(flag) L.push_back(i);
		}
	}
	L.push_back(l - 1);
	/// end
	/*printf("arr : \n");
	for(int i = l; i <= r; i ++)
	{
		printf("i = %d\n", i);
		for(int j = 1; j <= m; j ++)
		{
			printf("%d ", arr[i][j]);
		}
		printf("\n");
	}
	printf("ps & cnt\n");
	for(int i = l; i <= r; i ++)
	{
		printf("%lld %lld   ", cnt[i], ps[i]);
	}
	printf("\n showing L & R\n");
	for(auto x : L) printf("%d ", x);
	printf("\n");
	for(auto x : R) printf("%d ", x);
	printf("\n");
	*/
	for(int i1 = 0; i1 < SZ(L) - 1; i1 ++)
	{
		for(int i2 = 0; i2 < SZ(R) - 1; i2 ++)
		{
			for(int j = 1; j <= m; j ++)
			{
				Reset(arr[L[i1]][j]); Reset(arr[R[i2]][j]);
			}
			ll yal = 0;
			for(int j = 1; j <= m; j ++)
			{
				yal += unify2(arr[L[i1]][j], arr[R[i2]][j]);
			}
			///printf("i1 = %d i2 = %d yal = %lld jamleft = %lld jam right = %lld\n", i1, i2, yal, jam(L[i1 + 1] + 1, L[i1], 0, mid), jam(R[i2], R[i2 + 1] - 1, 1, mid));
			ll szl = (L[i1] - L[i1 + 1]), szr = R[i2 + 1] - R[i2];
			tot += jam(L[i1 + 1] + 1, L[i1], 0, mid) * szr +  jam(R[i2], R[i2 + 1] - 1, 1, mid) * szl - yal * szl * szr;
		}
	}
	///printf("tot = %lld\n", tot);
}
 
int main()
{
	scanf("%d%d", &n, &m);
	for(int i = 1; i <= n; i ++)
	{
	    for(int j = 1; j <= m; j ++)
	    {
		I[i][j] = (i - 1) * m + j;
		RI[I[i][j]] = Mp(i, j);
	    }
	}
	for(int i = 1; i <= n; i ++)
	{
		scanf("%s", C);
		for(int j = 0; j < m; j ++)
		{
			A[i][j + 1] = (C[j] == '1');
		}
	}
	solve(1, n);
	printf("%lld\n", tot);
	return 0;
}

Compilation message (stderr)

raspad.cpp: In function 'int main()':
raspad.cpp:227:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  227 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
raspad.cpp:238:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  238 |   scanf("%s", C);
      |   ~~~~~^~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 17 / 17
• Subtask 3: 35 / 35
• Subtask 4: 0 / 39