Submission #1208380

#	Time	Username	Problem	Language	Result	Execution time	Memory
1208380		Aviansh	Seats (IOI18_seats)	C++20	0 / 100	4091 ms	39472 KiB

seats

#include "seats.h"
#include <bits/stdc++.h>

using namespace std;

vector<int> r;
vector<int> c;
vector<int>prefmnr;
vector<int>prefmxr;
vector<int>prefmnc;
vector<int>prefmxc;
int ans;

void give_initial_chart(int h, int w, vector<int> R, vector<int> C) {
    r = R;
    c = C;
    prefmnr = vector<int>(h*w,-1);
    prefmxr = vector<int>(h*w,-1);
    prefmnc = vector<int>(h*w,-1);
    prefmxc = vector<int>(h*w,-1);
    ans=0;
    int mnr = r[0];
    int mxr = r[0];
    int mnc = c[0];
    int mxc = c[0];
    for(int i = 0;i<h*w;i++){
        mnr=min(mnr,r[i]);
        mxr=max(mxr,r[i]);
        mnc=min(mnc,c[i]);
        mxc=max(mxc,c[i]);
        prefmnr[i]=mnr;
        prefmxr[i]=mxr;
        prefmnc[i]=mnc;
        prefmxc[i]=mxc;
        bool val = ((i+1)==((mxr-mnr+1)*(mxc-mnc+1)));
        ans+=val;
    }
}

int swap_seats(int a, int b) {
    int ans2=0;
    int mnr = r[0];
    int mxr = r[0];
    int mnc = c[0];
    int mxc = c[0];
    for(int i = 0;i<r.size();i++){
        mnr=min(mnr,r[i]);
        mxr=max(mxr,r[i]);
        mnc=min(mnc,c[i]);
        mxc=max(mxc,c[i]);
        if(i>=a&&i<=b)
            continue;
        bool val = ((i+1)==((mxr-mnr+1)*(mxc-mnc+1)));
        ans2+=val;
    }
    for(int i = a;i<=b;i++){
        int mnr = prefmnr[i];
        int mxr = prefmxr[i];
        int mnc = prefmnc[i];
        int mxc = prefmxc[i];
        bool val = ((i+1)==((mxr-mnr+1)*(mxc-mnc+1)));
        ans-=val;
    }
    assert(ans==ans2);
    swap(r[a],r[b]);
    swap(c[a],c[b]);
    prefmnr[0]=r[0];
    prefmxr[0]=r[0];
    prefmnc[0]=c[0];
    prefmxc[0]=c[0];
    for(int i = a;i<=b;i++){
        if(i){
            prefmnr[i]=min(r[i],prefmnr[i-1]);
            prefmxr[i]=max(r[i],prefmxr[i-1]);
            prefmnc[i]=min(c[i],prefmnc[i-1]);
            prefmxc[i]=max(c[i],prefmxc[i-1]);
        }
    }
    for(int i = a;i<=b;i++){
        int mnr = prefmnr[i];
        int mxr = prefmxr[i];
        int mnc = prefmnc[i];
        int mxc = prefmxc[i];
        bool val = ((i+1)==((mxr-mnr+1)*(mxc-mnc+1)));
        ans+=val;
    }
    return ans;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 6
• Subtask 3: 0 / 20
• Subtask 4: 0 / 6
• Subtask 5: 0 / 33
• Subtask 6: 0 / 30