Compilare: main.cpp: In function 'int main()': main.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:21:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < n; j++) ~~^~~ main.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t k = 0; k < n; k++) ~~^~~ main.cpp:33:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:35:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < n; j++) ~~^~~ main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:44:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < n; j++) ~~^~~ main.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] o << a[i][j] << " \n"[j == n - 1]; ~~^~~~~~~~ main.cpp:52:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] o << "0" << " \n"[j == n - 1]; ~~^~~~~~~~