Submission #358387

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
358387	2021-01-25T12:05:20 Z	Ahmad_Hasan	Data Transfer (IOI19_transfer)	C++17	Compilation error	0 ms	0 KB

transfer

#include "transfer.h"
#include <iostream>
using namespace std;


vector<int> get_attachment(vector<int>src){
    if(src.size()<=30)
        return src;
    long long p=31;
    long long mod=1e9+7;
    long long ppow=1ll;
    long long hsh=0ll;
    int n=src.size();
    for(int i=0;i<n;i++){
        hsh+=src[i]*ppow;
        hsh%=mod;
        ppow*=p;
        ppow%=mod;
    }
    vector<int>ret(30);
    for(int i=0;i<30;i++)ret[i]=!!(hsh&(1<<i));

    return ret;
}

vector<int> retrieve(vector<int>data){
    vector<int>ret;
    if(data.size()<=60){
        int n=data.size();
        for(int i=n/2;i<n;i++)
            ret.push_back(data[i]);
    }else{

        long long p=31;
        long long mod=1e9+7;
        long long ppow=1ll;
        long long hsh=0ll;
        int n=data.size()-30;
        vector<int>ret;
        for(int i=0;i<n;i++){
            hsh+=data[i]*ppow;
            hsh%=mod;
            ppow*=p;
            ppow%=mod;
        }
        int f=0;
        for(int i=n;i<data.size();i++){
            if(data[i]!=!!(hsh&(1<<(i-n))))
                f=1;
        }
        if(!f){
            for(int i=0;i<n;i++){
                ret.push_back(data[i]);
            }
            return ret;
        }
        for(int i=0;i<n;i++){
            data[i]=!data[i];

            p=31;
            mod=1e9+7;
            ppow=1ll;
            hsh=0ll;
            for(int i=0;i<n;i++){
                hsh+=data[i]*ppow;
                hsh%=mod;
                ppow*=p;
                ppow%=mod;
            }
            int f=0;
            for(int i=n;i<data.size();i++){
                if(data[i]!=!!(hsh&(1<<(i-n))))
                    f=1;
            }
            if(!f){
                for(int i=0;i<n;i++){
                    ret.push_back(data[i]);
                }
                return ret;
            }

            data[i]=!data[i];
        }
        for(int i=0;i<n;i++){
            ret.push_back(data[i]);
        }
        return ret;

    }
    return ret;
}


static inline string run_scenario() {
	int c;
	cin >> c;
	if (c < -1)
		return "invalid corruption index";
	string source_str;
	cin >> source_str;
	const int N = source_str.size();
	const int max_attachment_size = 2*N;
	vector<int> source;
	for (int i=0; i<N; i++)
		source.push_back(source_str[i]-'0');

	vector<int> attachment = get_attachment(source);
	if (int(attachment.size()) > max_attachment_size)
		return "attachment too large";
	for (int x : attachment)
		if (x != 0 && x != 1)
			return "invalid attachment integer value";

	vector<int> data(source);
	data.insert(data.end(), attachment.begin(), attachment.end());

	if (c >= int(data.size()))
		return "invalid corruption index";

	if (c >= 0)
		data[c] = 1-data[c];

	vector<int> result_source = retrieve(data);
	if (source != result_source)
		return "wrong source retrieval";

	return string("OK K=")+to_string(attachment.size());
}

int main() {
	int T;
	cin >> T;
	for (int scenario = 0; scenario < T; scenario++) {
		string result = run_scenario();
		cout << "scenario #" << scenario << ": " << result << endl;
	}
	return 0;
}

Compilation message

transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:47:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for(int i=n;i<data.size();i++){
      |                     ~^~~~~~~~~~~~
transfer.cpp:71:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |             for(int i=n;i<data.size();i++){
      |                         ~^~~~~~~~~~~~
/tmp/ccrsCOlr.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cccXSTCb.o:transfer.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status