Compilare: main.cpp: In function 'int main()': main.cpp:91:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < p; i++) ~~^~~ main.cpp:96:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < q; j++) ~~^~~ main.cpp:115:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < p; i++) ~~^~~ main.cpp:117:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < q; j++) ~~^~~ main.cpp:133:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < p; i++) ~~^~~ main.cpp:135:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < q; j++) ~~^~~