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第六回オフラインリアルタイム参考問題

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コードを修正しました。
解き方は修正前と同じですが、コードは短くなったので見やすくなったかと思います。

#define BOOST_TEST_MAIN
#include <boost/test/included/unit_test.hpp>

namespace{
using namespace std;
using namespace boost;
typedef pair<size_t, size_t> pair_t;

vector<pair_t> get_rect(const string& s){
    vector<pair_t> v;
    for(size_t i=0; i<s.length(); i+=3){
        if(s[i] == '-'){
            continue;
        }
        v.push_back(pair_t(lexical_cast<size_t>(s.substr(i,1)),lexical_cast<size_t>(s.substr(i+1,1))));
    }
    return v;
}

void set_pos(set<string>& s, pair_t x, pair_t y){
    for(size_t j=y.first; j<=y.second; ++j){
        for(size_t i=x.first; i<=x.second; ++i){
            s.insert(lexical_cast<string>(i) + lexical_cast<string>(j));
        }
    }
}

bool same(const set<string>& red, const string& green){
    set<string>::iterator found = find(red.begin(), red.end(), green);
    return found != red.end();
}

size_t solve(const string& s){
    vector<pair_t> pos = get_rect(s);
    set<string> red, green;
    for(size_t i=1; i<3; ++i){
        //長くてごめんなさい
        set_pos(red, pair_t(min(pos[0].first, pos[i].first), max(pos[0].first, pos[i].first)), pair_t(min(pos[0].second, pos[i].second), max(pos[0].second, pos[i].second)));
        set_pos(green, pair_t(min(pos[3].first, pos[i+3].first), max(pos[3].first, pos[i+3].first)), pair_t(min(pos[3].second, pos[i+3].second), max(pos[3].second, pos[i+3].second)));
    }
    return count_if(green.begin(), green.end(), bind(&same, red, _1));
}
}

//以下はテスト
BOOST_AUTO_TEST_CASE( solve_test1 ){
    BOOST_CHECK_EQUAL(solve("23-94-28,89-06-51"), 11);
}

BOOST_AUTO_TEST_CASE( solve_test2 ){
    BOOST_CHECK_EQUAL(solve("11-84-58,02-73-69"), 40);
}

BOOST_AUTO_TEST_CASE( solve_test3 ){
    BOOST_CHECK_EQUAL(solve("18-41-86,77-04-32"), 26);
}

BOOST_AUTO_TEST_CASE( solve_test4 ){
    BOOST_CHECK_EQUAL(solve("81-88-23,64-58-14"), 0);
}

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