Compilare: main.cpp: In function 'void moveleft()': main.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp: In function 'void moveright()': main.cpp:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:40:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 1; j < m; j++) ~~^~~ main.cpp: In function 'void up()': main.cpp:58:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < m; j++) ~~^~~ main.cpp: In function 'void down()': main.cpp:74:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i < n; i++) ~~^~~ main.cpp:76:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < m; j++) ~~^~~ main.cpp: In function 'void reset()': main.cpp:92:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:94:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < m; j++) ~~^~~ main.cpp: In function 'int main()': main.cpp:106:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:108:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < m; j++) ~~^~~ main.cpp:121:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:123:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < m; j++) ~~^~~