Submission #375537

#	Time	Username	Problem	Language	Result	Execution time	Memory
375537		MilosMilutinovic	Handcrafted Gift (IOI20_gift)	C++14	Compilation error	0 ms	0 KiB

gift

//#include "gift.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define pii pair<int,int>
vector<pii> Compress(vector<pii> a){
    vector<pii> ev;
    for(auto i:a){
        ev.pb({i.first,-1});
        ev.pb({i.second,1});
    }
    sort(ev.begin(),ev.end());
    vector<pii> ans;
    int l,bal=0;
    for(auto i:ev){
        if(i.second==-1){
            if(bal==0)l=i.first;
            ++bal;
        }else{
            --bal;
            if(bal==0)ans.pb({l,i.first});
            //if(bal==0)printf("%i %i\n",l,i.first);
        }
    }
    return ans;
}
void craft(string s){cout<<s<<"\n";}
int construct(int n,int r,vector<int> a,vector<int> b,vector<int> x){
    bool SubTask1=true,SubTask2=true;
    for(int i=0;i<r;i++){
        if(x[i]==1)SubTask2=false;
        else SubTask1=false;
    }
    if(SubTask1){
        string ans="";
        for(int i=0;i<n;i++)ans+='R';
        craft(ans);
        return 1;
    }
    if(SubTask2){
        for(int i=0;i<r;i++)if(a[i]==b[i])return 0;
        string ans="";
        for(int i=0;i<n;i++)ans+=(i%2?'R':'B');
        craft(ans);
        return 1;
    }
    if(n<=18&&r<=18){
        for(int i=0;i<(1<<n);i++){
            string ans="";
            for(int j=0;j<n;j++){
                if(i&(1<<j))ans+='R';
                else ans+='B';
            }
            bool ok=true;
            for(int i=0;i<r;i++){
                map<char,int> was;
                was.clear();
                for(int j=a[i];j<=b[i];j++)was[ans[j]]=1;
                if((was['R']+was['B'])!=x[i]){ok=false;break;}
            }
            cout<<ans<<endl;
            if(ok){
                craft(ans);
                return 1;
            }
        }
        return 0;
    }
    string ans="";
    for(int i=0;i<n;i++)ans+='R';
    vector<pii> zer,one;
    for(int i=0;i<r;i++){
        if(x[i]==2&&a[i]==b[i])return 0;
        if(x[i]==1)zer.pb({a[i],b[i]});
        else one.pb({a[i],b[i]});
    }
    zer=Compress(zer);
    one=Compress(one);
    for(int i=0;i<(int)one.size();i++)ans[one[i].first]='B';
    craft(ans);
    return 1;
}
int main(){
    int n,q;scanf("%i%i",&n,&q);
    vector<int> a(q),b(q),x(q);
    for(int i=0;i<q;i++)scanf("%i%i%i",&a[i],&b[i],&x[i]);
    printf("%i\n",construct(n,q,a,b,x));
}

Compilation message (stderr)

gift.cpp: In function 'int main()':
gift.cpp:84:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   84 |     int n,q;scanf("%i%i",&n,&q);
      |             ~~~~~^~~~~~~~~~~~~~
gift.cpp:86:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   86 |     for(int i=0;i<q;i++)scanf("%i%i%i",&a[i],&b[i],&x[i]);
      |                         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/ccFbRzS5.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccByCcvF.o:gift.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status