Compilare: user.cpp: In function ‘int main()’: user.cpp:38:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[v1[1]].size()-1<mid) k=1; ^ user.cpp:44:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[v1[i]].size()-1<mid || hash1!=v[v1[i]][mid].first || hash2!=v[v1[i]][mid].second) {k=1;break;} ^ user.cpp:14:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ratina.in", "r", stdin); ^ user.cpp:15:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ratina.out", "w", stdout); ^ user.cpp:16:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:19:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n%s",s); ^ user.cpp:31:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&nr); ^ user.cpp:32:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=nr;i++) scanf("%d",&v1[i]); ^