Compilare: main.cpp: In function 'void pav(int, int, int, int&, int)': main.cpp:68:36: warning: operation on 'a[((i + l) - 1)][((j + l) - 1)]' may be undefined [-Wsequence-point] a[i+l-1][j+l-1]=a[i+l-1][j+l]=a[i+l-1][j+l-1]=k; ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:115:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pav.in","r",stdin); ^ main.cpp:116:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pav.out","w",stdout); ^