Submission #479683

#	Time	Username	Problem	Language	Result	Execution time	Memory
479683		julian33	Paint By Numbers (IOI16_paint)	C++14	59 / 100	2 ms	460 KiB

paint

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#define deb(...) logger(#__VA_ARGS__, __VA_ARGS__)
template<typename ...Args>
void logger(string vars, Args&&... values) {
    cerr<<vars<<" = ";
    string delim="";
    (...,(cerr<<delim<<values,delim=", "));
    cerr<<"\n";
}
#else
#define deb(...) logger(#__VA_ARGS__, __VA_ARGS__)
template<typename ...Args>
void logger(string vars, Args&&... values) {}
#endif

#define pb push_back
#define sz(x) (int)(x.size())
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
template<typename T> inline void maxa(T& a,T b){a=max(a,b);}
template<typename T> inline void mina(T& a,T b){a=min(a,b);} 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int mxN=2e5+5; //make sure this is right
const int mod=1e9+7;

int good[mxN][105],good2[mxN][105];

string solve_puzzle(string s,vector<int> c){
    int k=sz(c);
    int n=sz(s);
    vector<int> psa(n+1);
    for(int i=1;i<=n;i++)
        psa[i]=psa[i-1]+(s[i-1]=='_');
    queue<int> spots[k+2],pot[k+2];
    spots[0].push(-1);
    for(int i=1;i<=n;i++){
        for(int j=1;j<=k;j++){
            if(i-c[j-1]-1>=0 && s[i-c[j-1]-1]=='X'){
                while(sz(spots[j-1]) && spots[j-1].front()<i-c[j-1])
                    spots[j-1].pop();
                while(sz(pot[j-1]) && pot[j-1].front()<i-c[j-1])
                    pot[j-1].pop();
            }
            if(c[j-1]>i) continue;
            if(i-c[j-1]-1>=0 && s[i-c[j-1]-1]=='X') continue;
            if(psa[i]-psa[i-c[j-1]]>0) continue;
            while(sz(pot[j-1]) && pot[j-1].front()<i-c[j-1]){
                spots[j-1].push(pot[j-1].front());
                pot[j-1].pop();
            }
            if(!sz(spots[j-1])) continue;
            if(i<n && s[i]=='X') continue;
            good[i][j]=1;
            pot[j].push(i);
        }
    }
    for(int i=0;i<=k;i++){
        while(sz(spots[i])) spots[i].pop();
        while(sz(pot[i])) pot[i].pop();
    }
    spots[k+1].push(n+2);
    for(int i=n;i>=1;i--){
        for(int j=1;j<=k;j++){
            if(i+c[j-1]-1<n && s[i+c[j-1]-1]=='X'){
                while(sz(spots[j+1]) && spots[j+1].front()>i+c[j-1])
                    spots[j+1].pop();
                while(sz(pot[j+1]) && pot[j+1].front()>i+c[j-1])
                    pot[j+1].pop();
            }
            if(i+c[j-1]-1>n) continue;
            if(i+c[j-1]<=n && s[i+c[j-1]-1]=='X') continue;
            if(psa[i+c[j-1]-1]-psa[i-1]>0) continue;
            while(sz(pot[j+1]) && pot[j+1].front()>i+c[j-1]){
                spots[j+1].push(pot[j+1].front());
                pot[j+1].pop();
            }
            if(!sz(spots[j+1])) continue;
            if(i>=2 && s[i-2]=='X') continue;
            good2[i][j]=1;
            pot[j].push(i);
        }
    }
    vector<int> all(n+2);
    vector<int> ori;
    vector<pii> pos;
    for(int i=0;i<n;i++){
        if(s[i]=='X')
            ori.pb(i+1);
    }
    for(int i=1;i<=k;i++){
        vector<int> sum(n+2);
        int cnt=0;
        for(int j=c[i-1];j<=n;j++){
            if(good[j][i] && good2[j-c[i-1]+1][i]){
                cnt++;
                deb(i,j);
                sum[j-c[i-1]+1]++; sum[j+1]--;
                all[j-c[i-1]+1]++; all[j+1]--;
                pos.pb({j,j-c[i-1]+1});
            }
        }
        for(int j=1;j<=n;j++){
            sum[j]+=sum[j-1];
            if(sum[j]==cnt) {
                s[j-1]='X';
            }
        }
    }
    sort(pos.begin(),pos.end());
    vector<pii> other;
    priority_queue<pii,vector<pii>,greater<pii>> pq;
    for(int i=sz(ori)-1;i>=0;i--){
        while(sz(pos) && pos.back().first>=ori[i]){
            pq.push(pos.back());
            pos.pop_back();
        }
        while(sz(pq) && pq.top().second>ori[i])
            pq.pop();
        other.pb({ori[i],pq.top().first});
    }
    for(int i=1;i<=n;i++){
        all[i]+=all[i-1];
        if(all[i]==0){assert(s[i-1]!='X'),s[i-1]='_';}
        if(s[i-1]=='.') s[i-1]='?';
    }
    fill(all.begin(),all.end(),0);
    for(auto &[a,b]:other){
        deb(a,b);
        all[a]++; all[b+1]--;
    }
    for(int i=1;i<=n;i++){
        all[i]+=all[i-1];
        if(all[i]) s[i-1]='X';
    }
    return s;
}

Compilation message (stderr)

paint.cpp: In function 'std::string solve_puzzle(std::string, std::vector<int>)':
paint.cpp:133:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  133 |     for(auto &[a,b]:other){
      |               ^

• 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