Compilare: main.cpp: In function 'int main()': main.cpp:28:26: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 28 | for (size_t i = 1; i <= m; i++) { | ~~^~~~ main.cpp:29:30: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 29 | for (size_t j = 1; j <= n; j++) { | ~~^~~~