Compilare: main.cpp: In function 'void solve()': main.cpp:54:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; nr > 1 && i < primeNumbers.size() && primeNumbers[i] <= nr; i++) { ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ssnd.in", "r", stdin); ^ main.cpp:68:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ssnd.out", "w", stdout); ^ main.cpp:71:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:73:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &nr); ^