Compilare: main.cpp: In function 'int main()': main.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < k; i++) ~~^~~ main.cpp:19:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < m; j++) ~~^~~ main.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < k; i++) ~~^~~ main.cpp:31:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < n; j++) ~~^~~ main.cpp:35:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = m - n; j < m; j++) ~~^~~ main.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < n; j++) ~~^~~ main.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = m - n; j < m; j++) ~~^~~