Submission #69155

#	Time	Username	Problem	Language	Result	Execution time	Memory
69155		SmsS	Paint By Numbers (IOI16_paint)	C++14	59 / 100	4 ms	748 KiB

paint

#include<bits/stdc++.h>
using namespace std;
#define for2(a,b,c) for(int (a)=(b);(a)<(c);(a)++)
#include "paint.h"

#include <cstdlib>

const int maxn = 2e5+10;
const int maxk = 110;

int par[maxn];
bool f[maxn][maxk];

bool l[maxn][maxk]; /// 1- base for black
bool r[maxn][maxk]; /// 1- base for blackb
bool L[maxn][maxk]; /// 1- base for black
bool R[maxn][maxk]; /// 1- base for black


void solve(string &s,vector<int> &c,bool rev = 0){
	int n = s.length();
	int k = c.size();
	for2(i,0,n){
		par[i+1] = par[i] + (s[i]=='_');
	}
	f[0][0] = 1;
	for2(i,1,n+1) for2(j,0,k+1){
		f[i][j] = 0;
		if(s[i-1] == '_' || s[i-1] == '.'){
			f[i][j] |= f[i-1][j];
			if(f[i-1][j]){
				if(!rev) L[i][j] = 1;
				else R[n-i+1][j] = 1;
			}
		}
		if(!j && rev && f[i][j]){
			r[n-i+1][0] = 1;
		}
		if( j != 0 && (s[i-1] == 'X' || s[i-1] == '.') ){
			if( i >= c[j-1] && !(par[i] - par[i-c[j-1]]) && s[i-c[j-1]-1] != 'X' ){
				f[i][j] |= f[i-c[j-1]-1][j-1];
				if(f[i-c[j-1]-1][j-1] && s[i] != 'X'){
					if(!rev) l[i][j] = 1;
					else	 r[n-i+1][j] = 1;
				}
			}
		}
	}
}

bool ww[maxn];
int bb[maxn];

string solve_puzzle(string s, vector<int> c) {

	s = "__" + s + "__";
	int n = s.length();
	int k = c.size();
	solve(s,c);
	reverse(c.begin(),c.end());
	reverse(s.begin(),s.end());
	solve(s,c,1);
	reverse(c.begin(),c.end());
	reverse(s.begin(),s.end());

	string ans;
	for2(j,0,k+1) for(int i = n-1; i >= 0; i--) r[i][j] |= r[i+1][j];
	for2(i,1+2,n+1-2){
		bool w,b;
		int mx = 0;
		w = b = 0;
		for2(j,0,c.size()+1){
			if(s[i-1] == '_' || s[i-1] == '.'){
				if(L[i][j] && R[i][c.size()-j]) w = 1;
			}
			if(s[i-1] == 'X' || s[i-1] == '.'){
				if(l[i][j] && r[i+2][c.size()-j] && s[i] != 'X'){
					b = 1;
					mx = max(mx,c[j-1]);
				}
			}
		}
		if(b){
			bb[i-mx+1] ++;
			bb[i+1] --;
		}
		if(w) ww[i] = 1;
	}
	int cur = 0;
	for2(i,1+2,n+1-2){
		cur += bb[i];
		if(ww[i] && cur) ans += "?";
		else if(ww[i]) ans += "_";
		else ans += "X";
	}
    return ans;
}

Compilation message (stderr)

paint.cpp: In function 'std::__cxx11::string solve_puzzle(std::__cxx11::string, std::vector<int>)':
paint.cpp:3:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define for2(a,b,c) for(int (a)=(b);(a)<(c);(a)++)
                                     ~~~^~~~
paint.cpp:72:3: note: in expansion of macro 'for2'
   for2(j,0,c.size()+1){
   ^~~~

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