std::list<Point> landsNearby(int x, int y) {
std::list<Point> result;
if (isLand(x+1, y)) result.push_back(Point(x+1, y));
if (isLand(x-1, y)) result.push_back(Point(x-1, y));
if (isLand(x, y+1)) result.push_back(Point(x, y+1));
if (isLand(x, y-1)) result.push_back(Point(x, y-1));
return result;
}
vector<int> numIslands2(int m, int n, vector<pair<int, int>>& positions) {
vector<int> res;
vector<bool> isLand(m * n, false);
Union_Find uf(m * n);
int cnt = 0, cur, next, x, y, col, row;
for(int i = 0; i < positions.size(); ++i){
cnt++;
row = positions[i].first, col = positions[i].second;
cur = row * n + col;
isLand[cur] = true;
for(int j = 0; j < 4; ++j){
x = col + dx[j], y = row + dy[j];
next = y * n + x;
if(x >= 0 && x < n && y >= 0 && y < m && isLand[next]){
if(!uf.Find(cur, next)){
uf.Union(cur, next);
cnt--;
}
}
}
res.push_back(cnt);
}
return res;
}
int main(int argc, char** argv) {
std::cout << "*homework 15*" << std::endl;
std::ifstream inputFile(SOURCE_DIR "/sources/15/input.txt");
std::ofstream outputFile(SOURCE_DIR "/sources/15/output.txt");
if ( !inputFile.is_open() || !outputFile.is_open()){
std::cout << "cannot open files" << std::endl;
return 1;
}
size_t linesCount = 0;
size_t lineLength = 0;
std::string strBuff;
landmap_t landmap;
const std::string marks =
"01234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
while (std::getline(inputFile, strBuff)) {
landmap.push_back(strBuff);
}
linesCount = landmap.size();
lineLength = landmap[0].length();
renderMap(landmap);
unsigned int landCount = 0;
unsigned int correction = 0;
char currMark = marks[0];
//jump over lines
for (unsigned int y = 0; y < linesCount; y++) {
//jump inside line
for (unsigned int x = 0; x < lineLength; x++) {
if (isLand(landmap, x, y)) {
currMark = marks[landCount];
while (isLand(landmap, x + 1, y)) {
if (isLand(landmap, x, y - 1)
&& getLandChar(landmap, x, y - 1) != currMark) {
correction++;
}
if (isLand(landmap, x, y - 1)) {
currMark = getLandChar(landmap, x, y - 1);
}
setLandChar(landmap, x, y, currMark);
x++;
}
if (isLand(landmap, x, y - 1)
&& getLandChar(landmap, x, y - 1) != currMark) {
correction++;
}
setLandChar(landmap, x, y, currMark);
if (!isLand(landmap, x + 1, y)) {
landCount++;
}
}
}
//normalize line
for (unsigned int x = 0; x < lineLength; x++) {
if (isLand(landmap, x, y)) {
currMark = getLandChar(landmap, x, y);
while (isLand(landmap, x + 1, y)) {
setLandChar(landmap, x + 1, y, currMark);
x++;
}
}
}
}
renderMap(landmap);
std::cout << " l:" << landCount << " c:" << correction << " rez:"
<< landCount - correction << std::endl;
outputFile << landCount - correction << std::endl;
inputFile.close();
outputFile.close();
return 0;
}