Compilare: user.cpp: In function ‘void solve()’: user.cpp:75:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<val[n][s].size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:31:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n", &s, &n, &c); ^ user.cpp:33:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &vec[i].lungime, &vec[i].pret); ^ user.cpp: In function ‘int main()’: user.cpp:96:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sant.in", "r", stdin); ^ user.cpp:97:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sant.out", "w", stdout); ^