Compilare: user.cpp: In function ‘void genperm()’: user.cpp:50:17: warning: variable ‘irev’ set but not used [-Wunused-but-set-variable] int i , j , irev , i1rev , jrev , j1rev ; ^ user.cpp:50:39: warning: variable ‘j1rev’ set but not used [-Wunused-but-set-variable] int i , j , irev , i1rev , jrev , j1rev ; ^ user.cpp: In function ‘int main()’: user.cpp:101:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("summax.in","r",stdin); ^ user.cpp:102:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("summax.out","w",stdout); ^ user.cpp:104:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&p); ^ user.cpp:106:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&lp, &rp); ^ user.cpp:110:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&mat [ i ][ j ] ); ^