Compilare: main.cpp: In member function 'multime multime::operator+(const multime&)': main.cpp:44:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0, j = 0 ; i < m.size() && j < aux.m.size() ; ) { ~~^~~~~~~~~~ main.cpp:44:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0, j = 0 ; i < m.size() && j < aux.m.size() ; ) { ~~^~~~~~~~~~~~~~ main.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; i < m.size() ; ++ i) { ~~^~~~~~~~~~ main.cpp:61:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; j < aux.m.size() ; ++ j) { ~~^~~~~~~~~~~~~~ main.cpp: In member function 'multime multime::operator-(const multime&)': main.cpp:74:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < m.size() ; ++ i) { ~~^~~~~~~~~~ main.cpp:78:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < aux.m.size() ; ++ i) { ~~^~~~~~~~~~~~~~ main.cpp:77:13: warning: unused variable 'j' [-Wunused-variable] int j(0) ; ^ main.cpp: In function 'int main()': main.cpp:164:38: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(out, "%d\n", ret.m.size()) ; ^ main.cpp:152:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &mult) ; ^