Compilare: main.cpp: In function 'int main()': main.cpp:139:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xsizero.in", "r", stdin); ^ main.cpp:140:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xsizero.out", "w", stdout); ^ main.cpp:146:62: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s %s %s", (mat[1] + 1), (mat[2] + 1), (mat[3] + 1)); ^