Compilare: user.cpp: In function ‘void matrice(int, int, int, int)’: user.cpp:81:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < solve.size(); i++) ^ user.cpp:90:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < removeItems.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:193:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < line.size(); j++) ^ user.cpp:218:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < solve.size(); i++) ^ user.cpp:220:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < solve.size(); j++) ^ user.cpp:224:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ii = 0; ii < solve.size(); ii++) ^