Compilare: main.cpp: In function 'int main()': main.cpp:32:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ferma3.in","r",stdin); ^ main.cpp:33:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ferma3.out","w",stdout); ^ main.cpp:35:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d ", &cer, &n, &m); ^ main.cpp:38:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c ", &mat[i][j]); ^ main.cpp:89:15: warning: 'ch' may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d\n%c", st, dr, ch); ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~