Compilare: main.cpp: In function 'int nrperechi(int)': main.cpp:9:9: warning: unused variable 's' [-Wunused-variable] int s(0), i(1), j(n), cnt(0) ; ^ main.cpp: In function 'int main()': main.cpp:30:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sume2.in","r",stdin) ; ^ main.cpp:31:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sume2.out","w",stdout) ; ^ main.cpp:32:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n, &k) ; ^ main.cpp:35:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]) ; ^