Compilare: main.cpp: In function 'int findh(int)': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < h[key].size() ; i ++) ~~^~~~~~~~~~~~~~~ main.cpp:19:9: warning: unused variable 'i' [-Wunused-variable] int i, key = x % MOD; ^ main.cpp: In function 'void updateh(int, int)': main.cpp:28:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < h[key].size() ; i ++) ~~^~~~~~~~~~~~~~~ main.cpp:27:9: warning: unused variable 'i' [-Wunused-variable] int i, key = x % MOD; ^ main.cpp: In function 'void eraseh(int)': main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < h[key].size() ; i ++) ~~^~~~~~~~~~~~~~~ main.cpp:34:9: warning: unused variable 'i' [-Wunused-variable] int i, key = x % MOD; ^ main.cpp: In function 'int main()': main.cpp:76:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("secv5.in", "r", stdin); ^ main.cpp:77:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("secv5.out", "w", stdout); ^ main.cpp:79:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d" , &n , &l , &u); ^ main.cpp:81:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &v[i]); ^