Compilare: user.cpp: In function ‘int main()’: user.cpp:110:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 2;i <= S;i++){ ^ user.cpp:141:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1;i <= S;i++){ ^ user.cpp:193:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 2;i <= S;i++){ ^ user.cpp:75:15: warning: unused variable ‘k’ [-Wunused-variable] int q,i,j,k; ^ user.cpp:73:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qnp.in", "r", stdin); ^ user.cpp:74:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qnp.out", "w", stdout); ^ user.cpp:101:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &q); ^ user.cpp:106:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &cif[i]); ^ user.cpp:109:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%llu", &k); ^ user.cpp:132:13: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i == 1){ ^