Submission #80393

#	Time	Username	Problem	Language	Result	Execution time	Memory
80393		Plurm	Board (CEOI13_board)	C++11	40 / 100	1080 ms	1136 KiB

board

#include <bits/stdc++.h>
    using namespace std;
    char a[100005];
    char b[100005];
    class holder : public vector<bool> {
    public:
    	vector<int> hsh;
    	inline int ghash(){
    		return size() <= 20 ? -1 : hsh[size()-21];
    	}
    	inline int to_int(){
    		int v = 1;
    		for(int i = max((int)size()-20,0); i < size(); i++){
    			v *= 2;
    			if(at(i)) v++;
    		}
    		return v;
    	}
    	void push_back(bool b){
    		vector<bool>::push_back(b);
    		if(hsh.empty()) hsh.push_back(b ? 1 : 0);
    		else hsh.push_back((53*hsh.back() + (b ? 1 : 0)) % 1000003);
    	}
    	void pop_back(){
    		vector<bool>::pop_back();
    		hsh.pop_back();
    	}
    };
    inline void mmove(holder& x,char y){
    	int i;
    	switch(y){
    		case '1':
    		x.push_back(false);
    		break;
     
    		case '2':
    		x.push_back(true);
    		break;
     
    		case 'U':
    		x.pop_back();
    		break;
     
    		case 'L':
    		for(i = x.size()-1; i >= 0; i--){
    			if(x[i]){
    				x[i] = false;
    				break;
    			}else{
    				x[i] = true;
    			}
    		}
    		for(; i < x.size(); i++){
    			if(i == 0) x.hsh[i] = x[i] ? 1 : 0;
    			else x.hsh[i] = (x.hsh[i-1]*53 + (x[i] ? 1 : 0)) % 1000003;
    		}
    		break;
     
    		case 'R':
    		for(i = x.size()-1; i >= 0; i--){
    			if(x[i]){
    				x[i] = false;
    			}else{
    				x[i] = true;
    				break;
    			}
    		}
    		for(; i < x.size(); i++){
    			if(i == 0) x.hsh[i] = x[i] ? 1 : 0;
    			else x.hsh[i] = (x.hsh[i-1]*53 + (x[i] ? 1 : 0)) % 1000003;
    		}
    		break;
    	}
    }
    inline int glv(int x){
    	int l = 0;
    	while(x > 1){
    		x /= 2;
    		l++;
    	}
    	return l;
    }
    pair<int,int> mem[100005];
    int main(){
    	gets(a);
    	gets(b);
    	if(strlen(a) < strlen(b)){
    		for(int i = 0; i < 100005; i++){
    			swap(a[i],b[i]);
    		}
    	}
    	holder ma;
    	holder mb;
    	for(int i = 0; a[i]; i++){
    		mmove(ma,a[i]);
    	}
    	int lla = ma.size();
    	while(!ma.empty()){
    		mem[ma.size()] = make_pair(ma.ghash(),ma.to_int());
    		ma.pop_back();
    	}
    	for(int i = 0; b[i]; i++){
    		mmove(mb,b[i]);
    	}
    	int llb = mb.size();
    	int d = 1e9;
    	while(!mb.empty()){
    		if(mb.ghash() == mem[mb.size()].first){
    			d = min(d,(int)(lla - mb.size() + llb - mb.size() + abs(mb.to_int() - mem[mb.size()].second)));
    		}
    		mb.pop_back();
    	}
    	printf("%d\n",d);
    }

Compilation message (stderr)

board.cpp: In member function 'int holder::to_int()':
board.cpp:13:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int i = max((int)size()-20,0); i < size(); i++){
                                          ~~^~~~~~~~
board.cpp: In function 'void mmove(holder&, char)':
board.cpp:53:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(; i < x.size(); i++){
             ~~^~~~~~~~~~
board.cpp:68:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(; i < x.size(); i++){
             ~~^~~~~~~~~~
board.cpp: In function 'int main()':
board.cpp:85:12: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
      gets(a);
            ^
In file included from /usr/include/c++/7/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:46,
                 from board.cpp:1:
/usr/include/stdio.h:638:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
board.cpp:86:12: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
      gets(b);
            ^
In file included from /usr/include/c++/7/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:46,
                 from board.cpp:1:
/usr/include/stdio.h:638:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
board.cpp:85:10: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
      gets(a);
      ~~~~^~~
board.cpp:86:10: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
      gets(b);
      ~~~~^~~
/tmp/ccN8IYws.o: In function `main':
board.cpp:(.text.startup+0x2a): warning: the `gets' function is dangerous and should not be used.

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10