Submission #28726

#	Time	Username	Problem	Language	Result	Execution time	Memory
28726		repeating	Paint By Numbers (IOI16_paint)	C++11	90 / 100	49 ms	94812 KiB

paint

#include <bits/stdc++.h>
#include "paint.h"
#define F first
#define S second
#define P push
#define pb push_back
#define MEM(dp,i) memset(dp,i,sizeof(dp))
#define W while
#define R return
#define C continue
#define SI size()
#define ll long long
#define ld long double
#define pll pair<ll,ll>
#define pii pair<int,int>
#define SF(x) scanf("%I64d",&x)
#define SF2(x,y) scanf("%I64d%I64d",&x,&y)
#define SF3(x,y,z) scanf("%I64d%I64d%I64d",&x,&y,&z)
#define SF4(x,y,z,o) scanf("%I64d%I64d%I64d%I64d",&x,&y,&z,&o)
#define all(v) v.begin(),v.end()

using namespace std;
const long long INF = 1e15;
const int MX=200005;

vector<int> c;
string s;
int pr[MX];
int prb[MX];
int k,n;
int dp[MX][105];
int seg(int x,int y){
    if(x>y)R 0;
    int ret=pr[y];
    if(x)ret-=pr[x-1];
    R ret;
}
int segb(int x,int y){
    if(x>y)R 0;
    int ret=prb[y];
    if(x)ret-=prb[x-1];
    R ret;
}
int w[MX];
int b[MX];
int DP(int x,int y){
    if(y==k&&segb(x,n-1)){R 0;}
    if(y==k){w[x]++;R 1;}
    if(x>=n)R 0;
    int &ret=dp[x][y];
    if(ret!=-1)R ret;
    ret=0;
    if(s[x]!='X'){
        ret=DP(x+1,y);
        if(DP(x+1,y)){
            w[x]++;
            w[x+1]--;
        }
    }
    if((x+c[y]==n||s[x+c[y]]!='X')&&seg(x,x+c[y]-1)==0&&x+c[y]-1<n){
        ret=max(ret,DP(x+c[y]+1,y+1));
        if(DP(x+c[y]+1,y+1)){
            w[x+c[y]]++;
            w[x+c[y]+1]--;
            b[x]++;
            b[x+c[y]]--;
        }
    }
//    cout<<x<<" "<<y<<" "<<ret<<endl;
    R ret;
}
string solve_puzzle(string s_, vector<int> c_) {
    s=s_;
    c=c_;
    n=s.SI;
    k=c.SI;
    MEM(dp,-1);
    pr[0]=(s[0]=='_');
    for(int i=1;i<n;i++){
        pr[i]=pr[i-1]+(s[i]=='_');
//        cout<<pr[i];
    }
    prb[0]=(s[0]=='X');
    for(int i=1;i<n;i++){
        prb[i]=prb[i-1]+(s[i]=='X');
    }
    DP(0,0);
    for(int i=1;i<n;i++){
        b[i]+=b[i-1];
        w[i]+=w[i-1];
    }
    string res="";

    for(int i=0;i<n;i++){
        if(b[i]&&w[i]){
            res+='?';
        }
        else if(b[i]){
            res+='X';
        }
        else{
            res+='_';
        }
    }
    return res;
}

• 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: 0 / 10