Compilare: user.cpp: In function ‘int main()’: user.cpp:54:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(2*l_zero>l) ^ user.cpp:62:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(2*l_zero==l) ^ user.cpp:70:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(2*l_zero<l) ^ user.cpp:5:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("matrice.in","r",stdin); ^ user.cpp:6:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("matrice.out","w",stdout); ^ user.cpp:8:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&a); ^ user.cpp:10:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&r[i]); ^ user.cpp:12:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&co[j]); ^