Compilare: user.cpp: In function ‘void suma()’: user.cpp:13:72: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] for (j=1;j<=m;j++) if (((v[i]==0) && (v[n+j]==0)) || (v[i]==1) && (v[n+j]==1)) sum=sum+a[i][j]; ~~~~~~~~~~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:33:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flip.in","r",stdin); ^ user.cpp:34:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flip.out","w",stdout); ^ user.cpp:35:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld",&n,&m); ^ user.cpp:37:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (j=1;j<=m;j++) scanf("%ld",&a[i][j]); ^