Compilare: main.cpp: In function 'int main()': main.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v.size() ; i++) ~~^~~~~~~~~~ main.cpp:102:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < drum.size() ; i++) ~~^~~~~~~~~~~~~ main.cpp:59:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in","r",stdin); ^ main.cpp:60:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out","w",stdout); ^ main.cpp:61:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:66:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&p); ^ main.cpp:100:21: warning: 'posy' may be used uninitialized in this function [-Wmaybe-uninitialized] recon(posx,posy); ^ main.cpp:100:21: warning: 'posx' may be used uninitialized in this function [-Wmaybe-uninitialized]