Submission #438953

#	Time	Username	Problem	Language	Result	Execution time	Memory
438953		adamjinwei	Paint By Numbers (IOI16_paint)	C++14	10 / 100	2053 ms	460 KiB

paint

#include <bits/stdc++.h>
#include "paint.h"
#define inf 1000000007
#define mod 1000000007
#define rnd() rand_num()
#define bigrnd() dis(rand_num)
//#pragma GCC optimize("Ofast","inline","-ffast-math")
//#pragma GCC target("avx,sse2,sse3,sse4,mmx")
//#define int long long
using namespace std;
unsigned sed=std::chrono::system_clock::now().time_since_epoch().count();
mt19937 rand_num(sed);
uniform_int_distribution<long long> dis(0,inf);
template <typename T> void read(T &x){
	x=0;char ch=getchar();int fh=1;
	while (ch<'0'||ch>'9'){if (ch=='-')fh=-1;ch=getchar();}
	while (ch>='0'&&ch<='9')x=x*10+ch-'0',ch=getchar();
	x*=fh;
}
template <typename T> void write(T x) {
	if (x<0) x=-x,putchar('-');
	if (x>9) write(x/10);
	putchar(x%10+'0');
}
template <typename T> void writeln(T x) {
	write(x);
	puts("");
}
int n,k;
int c[105];
char s[200005];
int id[105];
int cnt[200005][2];
bool app[200005];
void dfs(int x,int y)
{
	if(y>k)
	{
		memset(app,0,sizeof(app));
		for(int i=1;i<=k;++i)
			for(int j=id[i];j<=id[i]+c[i]-1;++j)
				app[j]=1;
		bool flag=true;
		for(int i=1;i<=n;++i)
			if((app[i]&&s[i]=='_')||(!app[i]&&s[i]=='X'))
			{
				flag=false;
				break;
			}
		if(!flag) return;
		memset(app,0,sizeof(app));
		for(int i=1;i<=k;++i)
			for(int j=id[i];j<=id[i]+c[i]-1;++j)
			{
				cnt[j][1]++;
				app[j]=1;
			}
		for(int i=1;i<=n;++i)
			if(!app[i])
				cnt[i][0]++;
		return;
	}
	if(x>n)
		return;
	for(int i=x;i<=n;++i)
		if(i+c[y]<=n||(y==k&&i+c[y]-1<=n))
		{
			bool flag=true;
			for(int j=i;j<=i+c[y]-1;++j)
				if(s[j]=='_')
					flag=false;
			if(s[i+c[y]]=='X'&&i+c[y]<=n)
				flag=false;
			if(flag)
			{
				id[y]=i;
				dfs(i+c[y]+1,y+1);
			}
		}
}
string solve_puzzle(string S,vector<int> C)
{
	n=S.size();
	k=C.size();
	for(int i=1;i<=k;++i)
		c[i]=C[i-1];
	for(int i=1;i<=n;++i)
		s[i]=S[i-1];
	dfs(1,1);
	string ans;
	for(int i=1;i<=n;++i)
		if(cnt[i][0]!=0&&cnt[i][1]==0)
			ans+="_";
		else if(cnt[i][0]==0&&cnt[i][1]!=0)
			ans+="X";
		else
			ans+="?";
	return ans;
}

• Subtask 1: 7 / 7
• Subtask 2: 3 / 3
• Subtask 3: 0 / 22
• Subtask 4: 0 / 27
• Subtask 5: 0 / 21
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10