Compilare: user.cpp: In function ‘int main()’: user.cpp:84:19: warning: statement has no effect [-Wunused-value] for(it; it <= j; ansq += mat[unde][y] - mat[unde][x - 1] , it += batog , unde++); ^ user.cpp:86:19: warning: statement has no effect [-Wunused-value] for(it; it <= j; ansq += mat[unde][y] , it += batog , unde++); ^ user.cpp: In function ‘void citeste(int&)’: user.cpp:18:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,DIM,stdin),poz=0; ^ user.cpp:23:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,DIM,stdin),poz=0; ^ user.cpp: In function ‘int main()’: user.cpp:29:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qxy.in","r",stdin); ^ user.cpp:30:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qxy.out","w",stdout); ^