Compilare: user.cpp: In function ‘int main()’: user.cpp:10:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,m,tot=0,a,b,w; ^ user.cpp:10:13: warning: unused variable ‘n’ [-Wunused-variable] int i,j,n,m,tot=0,a,b,w; ^ user.cpp:10:15: warning: unused variable ‘m’ [-Wunused-variable] int i,j,n,m,tot=0,a,b,w; ^ user.cpp:8:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("texttrim.in","r",stdin); ^ user.cpp:9:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("texttrim.out","w",stdout); ^ user.cpp:11:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&v[27]); ^ user.cpp:12:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=0;i<26;i++) scanf("%d ",&v[i]); ^ user.cpp:13:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&v[26]); ^ user.cpp:14:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,1000001,stdin); ^ user.cpp:15:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&w); ^ user.cpp:25:29: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(tot+a<=w-3&&tot+a+b>w) ^