Compilare: main.cpp: In function 'bool check(int, double, double)': main.cpp:36:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | if (j + pas < lines[i].size() && ishigher(x, y, lines[i][j + pas]) > 0) { | ~~~~~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:68:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for(i = 1; i < verticals.size(); i++){ | ~~^~~~~~~~~~~~~~~~~~ main.cpp:75:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for(int k = 0; k < lines.size(); k++){ | ~~^~~~~~~~~~~~~~ main.cpp:86:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | if(i + pas < verticals.size() && verticals[i + pas] <= x) | ~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp:92:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 92 | if(i != verticals.size() - 1) { | ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:102:18: warning: unused variable 'var' [-Wunused-variable] 102 | bool var = check(i,x ,y); | ^~~