Submission #1046421

#	Time	Username	Problem	Language	Result	Execution time	Memory
1046421		nightfal	Comparing Plants (IOI20_plants)	C++17	0 / 100	1 ms	604 KiB

plants

// #include "plants.h"
#include <iostream>
#include <cstdio>
#include <cassert>
#include <vector>
#include <utility>
#include <algorithm>
 
// using namespace std;
#define maxVal 1'000'000'001
static std:: vector<int> rank,lz,lzr;
static std:: vector<std::pair<int,int>> t,tr;
static std:: vector<std::vector<int>> g;
static std:: vector<std::vector<std::vector<int>>> power;
 
static int l,m;
void print(std::pair<int,int> p) {std::cout << "(" << p.first << "," << p.second << ") "; };
void print(std::vector<int> &v) {for(int elem: v) std::cout << elem << " "; std::cout << std::endl;}
void print(std::vector<std::vector<int>> &v) {for (auto elem: v) print(elem); std::cout << std::endl;}
void print(std::vector<std::pair<int,int>> &v) {for(auto [a,b]: v) std::cout << "(" << a << "," << b << ") ";std::cout << std::endl;}
void print(std::vector<std::vector<std::vector<int>>> &v) {for (auto elem: v) print(elem); std::cout << std::endl;}
 
std::pair<int,int> update(std::vector<std::pair<int,int>> &t, std::vector<int> &lz, int node,int start,int end,int left,int right,int diff) {
    if (left <= start and end <= right) lz[node] += diff;
    if (start!=end) { lz[2*node] += lz[node]; lz[2*node+1] += lz[node];}
    t[node].first += lz[node]; lz[node]=0;
    if (right < start or end < left) return {maxVal,m+1};
    if (left <= start and end <= right) return t[node];
 
    int mid=(start+end)/2;
    auto ans1  = update(t,lz,2*node,start,mid,left,right,diff);
    auto ans2  = update(t,lz,2*node+1,mid+1,end,left,right,diff);
    auto ans = std::min(ans1,ans2);
    t[node] = std::min(t[2*node],t[2*node+1]);
    return ans;    
}
std::pair<int,int> findMin(std::vector<std::pair<int,int>> &t, std::vector<int> &lz, int node, int start, int end, int left, int right) {
    if (start!=end) {lz[2*node] += lz[node]; lz[2*node+1] += lz[node];}
    t[node].first += lz[node]; lz[node]=0;
    if (right < start or end < left) return {maxVal,m+1};
    if (left <= start and end <= right) return t[node];
    
    int mid=(start+end)/2;
    auto min1 = findMin(t,lz,2*node,start,mid,left,right);
    auto min2 = findMin(t,lz,2*node+1,mid+1,end,left,right);
    auto ans = std::min(min1,min2);
    t[node] = std::min(t[2*node],t[2*node+1]);    
    return ans;
}
void segInit(std::vector<int> &r, std::vector<std::pair<int,int>> &t, int node, int start, int end) {
    if (start==end) {t[node]={r[start],start}; return;}
    int mid=(start+end)/2;
    segInit(r,t, 2*node,start,mid);
    segInit(r,t, 2*node+1,mid+1,end);
    t[node] = std::min(t[2*node],t[2*node+1]);
    return;
}
int findPreMinI(std::vector<std::pair<int,int>> &t, std::vector<int> &lz, int k,int minI1) {
    int ans = minI1;
    if (minI1>0) {
        auto [min2,minI2] = findMin(t,lz,1,0,m-1,std::max(0,minI1-k+1),minI1-1);
        if (min2==0) ans = minI2;
    }
    if (minI1-k+1<0) {
        auto [min2,minI2] = findMin(t,lz,1,0,m-1,minI1-k+1+m,m-1);
        if (min2==0) ans = minI2;
    }
    return ans;
}
int computeRank(std::vector<std::pair<int,int>> &t, std::vector<int> &lz, int minI1, int k, int ranking) {
 
    if (rank[minI1]!=m) return ranking;
    int minI2 = findPreMinI(t,lz,k,minI1);
 
    while (minI2 != minI1) {
        ranking = computeRank(t,lz,minI2,k,ranking); 
        minI2 = findPreMinI(t,lz,k,minI1);
    }
    rank[minI1] = ranking--;
    update(t,lz,1,0,m-1,minI1,minI1,m-1);
    if(minI1>0) update(t,lz,1,0,m-1,std::max(0,minI1-k+1),minI1-1,-1);
    if(minI1-k+1<0) update(t,lz,1,0,m-1,minI1-k+1+m,m-1,-1);
 
    return ranking;
}
 
bool inRangeLeft(int z, int y, int left) {return y < z && (z < left || left <= y) || z < y && (z < left && left <= y);}
bool inRangeRight(int z, int y, int right) {return z < y && (right < z || y <= right) || y < z && (y <= right && right < z);}
 
int compare(int x, int y) {
    int left, i=0, z=x;
    int found = -1;
    while(true) {
        left = power[i][z][0];
        if(left==-1) break;
        if(inRangeLeft(z,y,left)) {found = left; break;}
        i++;
    }
    for(int j=i-1; j>=0; j--) {
        left = power[j][z][0];
        if(left==-1) continue;
        if(inRangeLeft(z,y,left)) {found = left; continue;}
        else z = left; 
    }
    left = power[0][z][0];
    assert(found==left);
    if (left!=-1 && inRangeLeft(z,y,left) && -rank[z]>-rank[y]) return 1;
 
    int right; 
    i=0; z= x; found = -1;
    while(true) {
        right = power[i][z][1];
        if(right==-1) break;
        if(inRangeRight(z,y,right)) {found = right; break;}
        i++;
    }
    for(int j=i-1; j>=0; j--) {
        right = power[j][z][1];
        if(right==-1) continue;
        if(inRangeRight(z,y,right)) {found = right; continue;}
    }
    right = power[0][z][1];
    assert(found==right);
    if(right!=-1 && inRangeRight(z,y,right) && -rank[z]>-rank[y]) return 1;
    
    return 0;
}
void calPower() {
    int x = m-1, cnt=1;
    while (x) {x>>=1; cnt++;}
    cnt++;
    power.resize(cnt,std::vector<std::vector<int>>(m,std::vector<int>(2,-1)));
    for(int j=0; j<m; j++)
        for(int x=0; x<2; x++)
            power[0][j][x] = g[j][x];
    
    for (int i=1; i<cnt; i++)
        for(int j=0; j<m; j++)
            for(int x=0; x<2; x++) {
                if (power[i-1][j][x] == -1) power[i][j][x] = -1;
                else power[i][j][x] = power[i-1][power[i-1][j][x]][x];
            }
    // std::cout << "rank: "<<std::endl; print(rank);
    // std::cout << "power: "<<std::endl; print(power);
    // std::cout << "rangeLR: "<<std::endl; print(rangeLR);
}
void calReachability(int k) {
    tr.resize(4*m); lzr.resize(4*m);
    std::vector<std::pair<int,int>> rankInv;
    for(int i=0; i<m; i++) {rank[i] = -rank[i]; rankInv.push_back({rank[i],i}); }
    sort(rankInv.begin(),rankInv.end());
    segInit(rank,tr,1,0,m-1);
 
    g.resize(m,std::vector<int>(2,-1));
    
    for(auto [val,i]: rankInv) {
        std::pair<int,int> temp1 ={maxVal,m+1}, temp2={maxVal,m+1};
        if (i>0) temp1 = findMin(tr,lzr,1,0,m-1,std::max(0,i-k+1),i-1);
        if (i-k+1<0) temp2 = findMin(tr,lzr,1,0,m-1,i-k+1+m,m-1);
        temp1 = std::min(temp1,temp2); 
        if (temp1.first <=0) g[i][0] = temp1.second;
 
        temp1 ={maxVal,m+1}, temp2={maxVal,m+1};
        if (i+1<m) temp1 = findMin(tr,lzr,1,0,m-1,i+1,std::min(m-1,i+k-1));
        if (i+k-1>m-1) temp2 = findMin(tr,lzr,1,0,m-1,0,i+k-1-m);
        temp1 = std::min(temp1,temp2);
        if (temp1.first <= 0) g[i][1] = temp1.second;
        update(tr,lzr,1,0,m-1,i,i,m);
    }
    calPower();
    return;
}
void init(int k, std::vector<int> r) {
    int n = r.size(); 
    m=n; l=k;
    t.resize(4*n); lz.resize(4*n); 
    segInit(r,t,1,0,n-1);
    rank.resize(n,n);
    int ranking = n-1;
    while (ranking >=0) {
        auto [min1,minI1] = findMin(t,lz,1,0,n-1,0,n-1);
        ranking = computeRank(t,lz,minI1,k,ranking);
    }
    calReachability(k);
	return;
}
int compare_plants(int x, int y) {
    int ans = compare(x,y);
    if (ans) return ans;
    else return -compare(y,x);
}

Compilation message (stderr)

plants.cpp: In function 'bool inRangeLeft(int, int, int)':
plants.cpp:87:56: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   87 | bool inRangeLeft(int z, int y, int left) {return y < z && (z < left || left <= y) || z < y && (z < left && left <= y);}
      |                                                  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
plants.cpp: In function 'bool inRangeRight(int, int, int)':
plants.cpp:88:58: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   88 | bool inRangeRight(int z, int y, int right) {return z < y && (right < z || y <= right) || y < z && (y <= right && right < z);}
      |                                                    ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 11
• Subtask 6: 0 / 15
• Subtask 7: 0 / 25