Compilare: main.cpp:10:23: warning: integer overflow in expression [-Woverflow] const int INF=((1<<31)-1)+1; ~~~~~~~^~ main.cpp: In function 'int main()': main.cpp:65:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(iname,"r",stdin); ^ main.cpp:66:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(oname,"w",stdout); ^ main.cpp:67:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n",&n,&m,&q); ^ main.cpp:70:41: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s[i]+1,sizeof(s[i]),stdin); ^