Compilare: main.cpp: In function 'int main()': main.cpp:31:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v.size(); i++) ~^~~~~~~~~ main.cpp:11:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("vase.in","r",stdin); ^ main.cpp:12:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("vase.out","w",stdout); ^ main.cpp:15:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld\n",&n); ^ main.cpp:18:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %c\n",&vol,&cl1); ^ main.cpp:28:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&x); ^ main.cpp:67:11: warning: 'cl2' may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%lld %c\n%lld %c\n",m1,cl1,m2,cl2); ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~