Submission #927729

#	Time	Username	Problem	Language	Result	Execution time	Memory
927729		MrDeboo	Seats (IOI18_seats)	C++17	Compilation error	0 ms	0 KiB

seats

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
using ordered_set = tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>;
vector<pair<int,int>>v;
bool hehe=0;
map<int,ordered_set>a,b;
int slv(int in){
    pair<pair<int,int>,pair<int,int>>pr={{v[in].first,v[in].first},{v[in].second,v[in].second}};
    for(int i=in;i>=0;i--){
        pr.first.first=min(pr.first.first,v[i].first);
        pr.first.second=max(pr.first.second,v[i].first);
        pr.second.first=min(pr.second.first,v[i].second);
        pr.second.second=max(pr.second.second,v[i].second);
    }
    return (in+1==(pr.second.second-pr.second.first+1)*(pr.first.second-pr.first.first+1));
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
    if(H==1)hehe=1;
    v.resize(H*W);
    for(int i=0;i<H*W;i++){
        v[i]={R[i],C[i]};
        if(i)a[C[i]+i].insert(C[i]);
        if(i)b[C[i]-i].insert(C[i]);
    }
}
void rmv(int in){
    if(in==0)return;
    a[v[in].second+i].erase(v[in].second);
    b[v[in].second-i].erase(v[in].second);
}
void ad(int in){
    if(in==0)return;
    a[v[in].second+i].insert(v[in].second);
    b[v[in].second-i].insert(v[in].second);
}
int clc(){
    int g=v[0].second;
    int ans=0;
    ans+=a[g].order_of_key(g);
    ans+=b[g].size()-b[g].order_of_key(g);
}
int swap_seats(int a, int b){
    if(hehe){
        rmv(a);
        rmv(b);
        swap(v[a],v[b]);
        ad(a);
        ad(b);
        return clc();
    }
    int ans=0;
    swap(v[a],v[b]);
    pair<pair<int,int>,pair<int,int>>pr={{v[0].first,v[0].first},{v[0].second,v[0].second}};
    for(int i=0;i<v.size();i++){
        pr.first.first=min(pr.first.first,v[i].first);
        pr.first.second=max(pr.first.second,v[i].first);
        pr.second.first=min(pr.second.first,v[i].second);
        pr.second.second=max(pr.second.second,v[i].second);
        if(i+1==(pr.second.second-pr.second.first+1)*(pr.first.second-pr.first.first+1))ans++;
    }
    return ans;
}

Compilation message (stderr)

seats.cpp: In function 'void rmv(int)':
seats.cpp:31:20: error: 'i' was not declared in this scope; did you mean 'in'?
   31 |     a[v[in].second+i].erase(v[in].second);
      |                    ^
      |                    in
seats.cpp: In function 'void ad(int)':
seats.cpp:36:20: error: 'i' was not declared in this scope; did you mean 'in'?
   36 |     a[v[in].second+i].insert(v[in].second);
      |                    ^
      |                    in
seats.cpp: In function 'int clc()':
seats.cpp:44:1: warning: no return statement in function returning non-void [-Wreturn-type]
   44 | }
      | ^
seats.cpp: In function 'int swap_seats(int, int)':
seats.cpp:57:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for(int i=0;i<v.size();i++){
      |                 ~^~~~~~~~~