Submission #1031883

#	Time	Username	Problem	Language	Result	Execution time	Memory
1031883		vjudge1	Mars (APIO22_mars)	C++17	0 / 100	0 ms	332 KiB

mars

#include "mars.h"
#include<bits/stdc++.h>
using namespace std;
bitset<50> grid[50];
void flod(int i,int j){
    if(i<0||i>30||j<0||j>30)return;
    if(!grid[i][j]) return;
    grid[i][j]=0;
    flod(i-1,j);
    flod(i+1,j);
    flod(i,j+1);
    flod(i,j-1);
}
string howmanyislands(int n){
    for(int i=0;i<n;i++)
        assert(grid[i].count()==n);
    int ans=0;
    for(int i=0;i<n;i++)
        for(int j=0;j<n;j++)
            ans+=grid[i][j],flod(i,j);
    string str;
    for(int i=0;i<100;i++)
        str+=48+(ans&1),ans>>=1;
    return str;
}
string encode_grid(int i,int j){
    string str;
    for(int I=0;I<10;I++)
        for(int J=0;J<10;J++)
            str+=48+grid[i+I][j+J];
    return str;
}
void putintogrid(string a,int i,int j){
    int CC=0;
    for(int I=0;I<10;I++) for(int J=0;J<10;J++)
        grid[i+I][j+J]=grid[i+I][j+J]|a[CC++]=='1';
}
std::string process(std::vector <std::vector<std::string>> a, int i, int j, int k, int n) {
    for(int i=0;i<2*n+1;i++)
        grid[i].reset();
    if(n<=4) {
        for(int i=0;i<2*n+1;i++)
            grid[i].reset();
        if(i&1||j&1) return a[0][0];
        if(max(i,j)==2*n-2*k-2) {
            grid[i][j]=a[0][0][0]=='1';
            grid[i+1][j]=a[1][0][0]=='1';
            grid[i][j+1]=a[0][1][0]=='1';
            grid[i+1][j+1]=a[1][1][0]=='1';
            grid[i+2][j+1]=a[2][1][0]=='1';
            grid[i+1][j+2]=a[1][2][0]=='1';
            putintogrid(a[2][0],i+2,j);
            putintogrid(a[2][2],i+2,j+2);
            putintogrid(a[0][2],i,j+2);
        } else return a[0][0];
        if(k==n-1)
            return howmanyislands(2*n+1);
        return encode_grid(i,j);
    }
    int szofg=2*n;
    set<int> important;
    important.insert(0);
    important.insert(szofg);
    important.insert(szofg-10);
    set<int>important2;
    important2.insert(0);
    important2.insert(szofg-10);
    if(szofg>20)
        important2.insert(szofg-20);
    if(szofg>20)
        important.insert(szofg-20);
    if(k==n-1){
        int k=2*n-9;
        if(n==5) {
            grid[i][j]=a[0][0][0]=='1';
            grid[i+1][j]=a[1][0][0]=='1';
            grid[i][j+1]=a[0][1][0]=='1';
            grid[i+1][j+1]=a[1][1][0]=='1';
            grid[i+2][j+1]=a[2][1][0]=='1';
            grid[i+1][j+2]=a[1][2][0]=='1';
            putintogrid(a[2][0],i+2,j);
            putintogrid(a[2][2],i+2,j+2);
            putintogrid(a[0][2],i,j+2);
        }else
        if(important2.size()==3)
            for(int i=0;i<3;i++)
                for(int j=0;j<3;j++)
                    putintogrid(a[i][j],max(0,szofg-7-(3-i)*10),max(0,szofg-7+(3-i)*10));
        else {
            putintogrid(a[0][0],0,0),putintogrid(a[2][2],k,k),putintogrid(a[2][0],k,0),putintogrid(a[0][2],0,k);
        }
        return howmanyislands(2*n+1);
    }
    if(k<5) {
        for(int i=0;i<2*n+1;i++)
            grid[i].reset();
        if(i&1||j&1) return a[0][0];
        int A=*--important.upper_bound(i);
        int B=*--important.upper_bound(j);
        if(max(i-A,j-B)==10-2*k-2||(!A&&!B&&max(i,j)==*++important.begin()-2-2*k)) {
            grid[i][j]=a[0][0][0]=='1';
            grid[i+1][j]=a[1][0][0]=='1';
            grid[i][j+1]=a[0][1][0]=='1';
            grid[i+1][j+1]=a[1][1][0]=='1';
            grid[i+2][j+1]=a[2][1][0]=='1';
            grid[i+1][j+2]=a[1][2][0]=='1';
            putintogrid(a[2][0],i+2,j);
            putintogrid(a[2][2],i+2,j+2);
            putintogrid(a[0][2],i,j+2);
        } else return a[0][0];
        return encode_grid(i+!!i*(k==4),j+!!j*(k==4));
    }
    int transport[30][30][15];
    for(auto i:important2){
        for(auto j:important2){
            int CC=5;
            int origi=i;
            int origj=j;
            if(!i){
                while(j)transport[0][j-=2][CC++]=1;
            }else if(!j) {
                while(i)transport[i-=2][0][CC++]=2;
            }else if(i==j){
                while(i)transport[i-=2][j-=2][CC++]=3;
            } else if(i<j) {
                while(i>2)transport[i-=2][j-=2][CC++]=3;
                transport[--i][j-=2][CC++]=4;
                while(j>2)transport[i-=2][j-=2][CC++]=1;
            } else {
                while(i>2)transport[i-=2][j-=2][CC++]=3;
                transport[--i][j-=2][CC++]=5;
                while(j>2)transport[i-=2][j-=2][CC++]=2;
            }
            i=origi;
            j=origj;
        }
    }
    if(i==0&&j==0)return a[0][0];
    if(transport[i][j][k]){
        if(transport[i][j][k]==1)
            return a[0][2];
        if(transport[i][j][k]==2)
            return a[2][0];
        if(transport[i][j][k]==3)
            return a[2][2];
        if(transport[i][j][k]==4)
            return a[1][2];
        if(transport[i][j][k]==5)
            return a[2][1];
        return a[0][0];
    }
    int x=max(i,j);
    if(x==1&&important2.size()==3) {
        int c=4+*++important2.begin()/2;
        if(c==k){
            return a[i][j];
        }
    }
    return a[0][0];
}

Compilation message (stderr)

In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from mars.cpp:2:
mars.cpp: In function 'std::string howmanyislands(int)':
mars.cpp:16:31: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   16 |         assert(grid[i].count()==n);
      |                ~~~~~~~~~~~~~~~^~~
mars.cpp: In function 'void putintogrid(std::string, int, int)':
mars.cpp:36:46: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
   36 |         grid[i+I][j+J]=grid[i+I][j+J]|a[CC++]=='1';
mars.cpp: In function 'std::string process(std::vector<std::vector<std::__cxx11::basic_string<char> > >, int, int, int, int)':
mars.cpp:132:41: warning: array subscript -1 is below array bounds of 'int [30][30][15]' [-Warray-bounds]
  132 |                 while(j>2)transport[i-=2][j-=2][CC++]=2;
      |                           ~~~~~~~~~~~~~~^
mars.cpp:113:9: note: while referencing 'transport'
  113 |     int transport[30][30][15];
      |         ^~~~~~~~~
mars.cpp:128:41: warning: array subscript -1 is below array bounds of 'int [30][30][15]' [-Warray-bounds]
  128 |                 while(j>2)transport[i-=2][j-=2][CC++]=1;
      |                           ~~~~~~~~~~~~~~^
mars.cpp:113:9: note: while referencing 'transport'
  113 |     int transport[30][30][15];
      |         ^~~~~~~~~

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