Submission #364926

#	Time	Username	Problem	Language	Result	Execution time	Memory
364926		CSQ31	Paint By Numbers (IOI16_paint)	C++14	100 / 100	683 ms	32864 KiB

paint

//#include "grader.cpp"
#include <cstdlib>
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define sz(a) (int)(a.size())
#define all(a) a.begin(),a.end()
#define lb lower_bound
#define ub upper_bound
#define owo ios_base::sync_with_stdio(0);cin.tie(0);
#define MOD (ll)(1e9+7)
#define INF (ll)(1e18)
#define debug(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false);\
debug("%s time : %.4fs\n", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))
typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> PII;
typedef pair<int,int> pii;
typedef vector<vector<int>> vii;
typedef vector<vector<ll>> VII;
ll gcd(ll a,ll b){if(!b)return a;else return gcd(b,a%b);}
std::string solve_puzzle(std::string s, std::vector<int> c){
	int n = sz(s);
	int k = sz(c);
	vector<int>w(n+2),b(n+2);
	vector<vector<bool>>dpp(n+2,vector<bool>(k+3)),dps(n+2,vector<bool>(k+3));
	for(int i=1;i<=n+1;i++){
		if(s[i-1] == '_')w[i]++;
		if(s[i-1] == 'X')b[i]++;
		b[i]+=b[i-1];
		w[i]+=w[i-1];
	}
	dpp[0][0] = 1;
	for(int i=1;i<=n;i++){
		if(!b[i])dpp[i][0] = 1;
		for(int j=1;j<=k;j++){
			int L = i-c[j-1];
			bool a = 0,b = 1;
			a = dpp[i-1][j];
			if(L > 0)b = (s[L-1] != 'X');
			b= b&((L==0 && j==1) || (L>=1 && dpp[L-1][j-1]));
			if(L>=0)b= b&(w[i]-w[L] == 0);
			if(s[i-1] == '_')dpp[i][j] = a;
			else if(s[i-1] == 'X')dpp[i][j] = b;
			else dpp[i][j] = (a||b);
			
		}
	}
	dps[n+1][k+1] = 1;
	for(int i=n;i>0;i--){
		if(!(b[n]-b[i-1]))dps[i][k+1] = 1;
		for(int j=1;j<=k;j++){
			int L = i+c[j-1];
			bool a = 0,b = 1;
			a = dps[i+1][j];
			if(L<=n)b = (s[L-1] != 'X');
			b= b&((L==n+1 && j==k) || (L<=n && dps[L+1][j+1]));
			if(L<=n+1)b=b&(w[L-1]-w[i-1] == 0); 
			if(s[i-1] == '_')dps[i][j] = a;
			else if(s[i-1] == 'X')dps[i][j] = b;
			else dps[i][j] = (a||b);
			
		}			
	}/*
	for(int i=0;i<=k;i++){
		for(int j=1;j<=n;j++){
			cout<<dpp[j][i]<<" ";
		}
		cout<<'\n';
	}
	cout<<'\n';
	for(int i=1;i<=k+1;i++){
		for(int j=1;j<=n;j++){
			cout<<dps[j][i]<<" ";
		}
		cout<<'\n';
	}
	cout<<'\n';
	*/
	vector<bool>canw(n+2,0);
	vector<ll>canb(n+2);
	for(int i=1;i<=n;i++){
		if(s[i-1] == 'X')continue;
		for(int j=0;j<=k;j++){
			if(dpp[i-1][j] && dps[i+1][j+1])canw[i] = 1;
			
		}
	}//check for white ,this works
	//to check for black iterate starting point and +1 -1,tedious fuck you
	for(int i=1;i<=n;i++){
		if(s[i-1] == 'W')continue;
		for(int j=1;j<=k;j++){
			int R = i+c[j-1];
			bool ok = 1;
			if(R<=n)ok = s[R-1] != 'X';
		    ok= ok&((R==n+1 && j==k) || (R<=n && dps[R+1][j+1])); //check right side
		    ok= ok&((i == 1 && j == 1) || (i>1 && dpp[i-2][j-1] && s[i-2] != 'X')); //check left side
		    ok= ok&(R-1<=n && w[R-1] - w[i-1] == 0); //check for no white space
		    if(ok){
		      canb[i]++;
		      canb[R]--;
		  }
		}
	}
	/*
	for(int i=1;i<=n;i++)cout<<canw[i]<<" ";
	cout<<'\n';
	for(int i=1;i<=n;i++)cout<<canb[i]<<" ";
	cout<<'\n';
	* */
	for(int i=1;i<=n;i++)canb[i]+=canb[i-1];
	//for(int i=1;i<=n;i++)cout<<canb[i]<<" ";
	//cout<<'\n';
	string ans;
	for(int i=1;i<=n;i++){
		if(canw[i] && canb[i])ans+="?";
		else if(canw[i])ans+="_";
		else ans+="X";
	}
	return ans;
}

• Subtask 1: 7 / 7
• Subtask 2: 3 / 3
• Subtask 3: 22 / 22
• Subtask 4: 27 / 27
• Subtask 5: 21 / 21
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10