Compilare: user.cpp: In function ‘void solve()’: user.cpp:37:9: warning: unused variable ‘it’ [-Wunused-variable] int it=1; ^ user.cpp:38:9: warning: unused variable ‘iter’ [-Wunused-variable] int iter=2; ^ user.cpp: In function ‘void write()’: user.cpp:53:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<solutie.size();i++){ ^ user.cpp: In function ‘void read()’: user.cpp:23:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.in","r",stdin); ^ user.cpp:24:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:26:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^ user.cpp: In function ‘void write()’: user.cpp:51:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.out","w",stdout); ^