Submission #204392

#	Time	Username	Problem	Language	Result	Execution time	Memory
204392		awlintqaa	Paint By Numbers (IOI16_paint)	C++14	59 / 100	56 ms	85752 KiB

paint

#define fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#include <bits/stdc++.h>
using namespace std;
#define sqr 200
#define mid (l+r)/2
#define pb push_back
#define ppb pop_back
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define ins insert
#define era erase
#define C continue
#define mem(dp,i) memset(dp,i,sizeof(dp))
#define mset multiset
typedef long long ll;
typedef short int si;
typedef long double ld;
typedef pair<int,int> pi;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pi> vpi;
typedef vector<pll> vpll;
const ll mod=1e9+7;
const ll inf= 4e18;
const ld pai=acos(-1);
#include "paint.h"
#include <cstdlib>
int n ,k ;
string s;
int a[200009];
int bs[200009];
int yes[200009][2];
int dp[200009][109];
void upd(int l,int r,int t){
        yes[l][t]++;
        yes[r+1][t]--;
}
int sum(int l,int r){
        if ( l>r || r>=n )return -1;
        int x=bs[r];
        if(l)x-=bs[l-1];
        return x;
}
int bt(int id,int crnt){
        if(id==n)return (crnt==k);
        int &ret=dp[id][crnt];
        if(ret!=-1) return ret;
        ret=0;
        if(s[id]=='_'){
                ret=bt(id+1,crnt);
        }
        if(s[id]=='.'){
                ret=bt(id+1,crnt);
                if(ret>0)upd(id,id,0);
                int z=1;
                if(crnt<k){
                        int l=id,r=id+a[crnt]-1;
                        int Sum=sum(l,r);
                        if(Sum!=a[crnt]) z=0;
                        if(r+1<n && s[r+1]=='X') z=0;
                        if(z){
                                z=bt(min(r+2,n),crnt+1);
                                if(z){
                                        upd(l,r,1);
                                        upd(r+1,r+1,0);
                                }
                        }
                        ret=max(ret,z);
                }
        }
        if(s[id]=='X' && crnt<k){
                int l=id,r=id+a[crnt]-1;
                int Sum=sum(l,r);
                if(Sum!=a[crnt])return ret=0;
                if(r+1<n && s[r+1]=='X') return ret=0;
                upd(l,r,1);
                upd(r+1,r+1,0);
                ret=bt( min ( r+2 , n ) ,crnt+1);
        }
        else if(s[id]=='X')return ret=0;
        return ret;
}
string solve_puzzle(string S , vector<int> c) {
        mem(dp,-1);
        s=S;
        n=S.size();
        k=c.size();
        for(int i=0;i<n;i++){
                bs[i]=(s[i]!='_');
                if(i)bs[i]+=bs[i-1];
        }
        for(int i=0;i<k;i++)a[i]=c[i];
        bt(0,0);
        for(int i=1;i<n;i++){
                for(int j=0;j<2;j++){
                        yes[i][j]+=yes[i-1][j];
                }
        }
        string ans="";
        for(int i=0;i<n;i++){
                if(s[i]!='.'){
                        ans+=s[i];
                        C;
                }
                if(yes[i][0] && yes[i][1])ans+='?';
                else if(yes[i][0])ans+='_';
                else ans+='X';
        }
        return ans;
}

• 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