Compilare: user.cpp: In function ‘void add(long long int)’: user.cpp:31:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[r].size(); ++i) ^ user.cpp:47:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[r].size(); ++i) ^ user.cpp: In function ‘int find(long long int)’: user.cpp:69:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[r].size(); ++i) ^ user.cpp:84:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[r].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:101:43: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long long int*’ [-Wformat=] scanf("%d%d%d%d%d",&a1,&a2,&a3,&a4,&a5); ^ user.cpp:101:43: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long long int*’ [-Wformat=] user.cpp:101:43: warning: format ‘%d’ expects argument of type ‘int*’, but argument 4 has type ‘long long int*’ [-Wformat=] user.cpp:101:43: warning: format ‘%d’ expects argument of type ‘int*’, but argument 5 has type ‘long long int*’ [-Wformat=] user.cpp:101:43: warning: format ‘%d’ expects argument of type ‘int*’, but argument 6 has type ‘long long int*’ [-Wformat=] user.cpp:99:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("eqs.in","r",stdin); ^ user.cpp:100:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("eqs.out","w",stdout); ^ user.cpp:101:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d",&a1,&a2,&a3,&a4,&a5); ^