Compilare: user.cpp: In function ‘int main()’: user.cpp:27:11: warning: unused variable ‘m’ [-Wunused-variable] int n,m,i,j,t1,t2,t3,a,b,co,clg,ex; ^ user.cpp:25:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("log.in","r",stdin); ^ user.cpp:26:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("log.out","w",stdout); ^ user.cpp:28:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(si+1,sizeof(char),SIZE,stdin); ^