Compilare: main.cpp: In function 'int solve(int)': main.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[nod].size();j++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:66:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[top[i]].size();j++) ~^~~~~~~~~~~~~~~~~ main.cpp:84:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<primes.size();i++) ~^~~~~~~~~~~~~~ main.cpp:46:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tenerife.in","r",stdin); ^ main.cpp:47:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tenerife.out","w",stdout); ^ main.cpp:49:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&N,&M,&K); ^ main.cpp:55:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&c); ^