Compilare: main.cpp: In function 'int main()': main.cpp:9:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.in","r",stdin); ^ main.cpp:10:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.out","w",stdout); ^ main.cpp:11:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ main.cpp:16:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %c",&i,&j,&c); ^ main.cpp:26:6: warning: 'pj' may be used uninitialized in this function [-Wmaybe-uninitialized] b[1]=pj; ~~~~^~~ main.cpp:27:11: warning: 'pi' may be used uninitialized in this function [-Wmaybe-uninitialized] v[pi][pj]=1; ~~~~~~~~~^~