Compilare: main.cpp: In function 'int main()': main.cpp:10:13: warning: unused variable 'x' [-Wunused-variable] int t,i,x,s=0,nrmax=0,n,s2=0,s3=0,z; ^ main.cpp:10:19: warning: unused variable 'nrmax' [-Wunused-variable] int t,i,x,s=0,nrmax=0,n,s2=0,s3=0,z; ^~~~~ main.cpp:11:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("23.in","r",stdin); ^ main.cpp:12:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("23.out","w",stdout); ^ main.cpp:13:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ main.cpp:16:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i].first); ^