Compilare: main.cpp: In function 'int main()': main.cpp:114:30: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 114 | for (size_t i = 0; i < a; ++i, out << '\n') { | ~~^~~ main.cpp:118:38: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 118 | for (size_t j = 0; j < b; ++j) out << ans[i][j] << ' '; | ~~^~~