Compilare: main.cpp: In function 'int main()': main.cpp:123:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < p; i++) ~~^~~ main.cpp:128:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < q; j++) ~~^~~ main.cpp:147:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < p; i++) ~~^~~ main.cpp:149:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < q; j++) ~~^~~ main.cpp:165:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < p; i++) ~~^~~ main.cpp:167:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < q; j++) ~~^~~