Compilare: main.cpp: In member function 'bool ecuatie::solved_by(const std::vector<float>&)': main.cpp:21:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<float>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int i = 0; i < coef.size(); i++) sum += coef[i] * sol[i]; | ~~^~~~~~~~~~~~~ main.cpp: In function 'ecuatie operator*(data, const ecuatie&)': main.cpp:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<float>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i = 0; i < ret.coef.size(); i++) { | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'ecuatie operator+(const ecuatie&, const ecuatie&)': main.cpp:43:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<float>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int i = 0; i < ret.coef.size(); i++) { | ~~^~~~~~~~~~~~~~~~~ main.cpp: In member function 'void sistem::simplify()': main.cpp:89:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<float>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 89 | if(i < ecuatii[j].coef.size() && abs(ecuatii[j].coef[i]) > EPS) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:99:39: warning: comparison of integer expressions of different signedness: 'std::vector<float>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 99 | if(ecuatii[i].coef.size() <= i || abs(ecuatii[i].coef[i]) < EPS ) { | ~~~~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp:117:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<float>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 117 | if(i < ecuatii[oi].coef.size()) ecuatii[oi] = ecuatii[oi] + (-ecuatii[oi].coef[i]) * ecuatii[i]; | ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:120:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<float>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 120 | if(i < solution.size()) solution[i] = ecuatii[i].rez; | ~~^~~~~~~~~~~~~~~~~ main.cpp:83:19: warning: unused variable 'vars' [-Wunused-variable] 83 | const int vars = ecuatii[0].coef.size(); // numarul de necunoscute | ^~~~