Compilare: main.cpp: In function 'int main()': main.cpp:93:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("2sah.out", "w", stdout); ^ main.cpp: In function 'void Read(int&)': main.cpp:66:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:71:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp: In function 'int main()': main.cpp:100:16: warning: 'alfa.matrix::N' may be used uninitialized in this function [-Wmaybe-uninitialized] matrix alfa, beta; ^~~~ main.cpp:22:30: warning: 'alfa.matrix::M' may be used uninitialized in this function [-Wmaybe-uninitialized] for(int j = 0; j < M; j++) ~~^~~ main.cpp:100:16: note: 'alfa.matrix::M' was declared here matrix alfa, beta; ^~~~