Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:99:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < curr.size(); ++i) { ~~^~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:125:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pastrafaceri.in","r",stdin); ^ user.cpp:126:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pastrafaceri.out","w",stdout); ^ user.cpp: In function ‘void solve(int)’: user.cpp:100:44: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (i - l == N) sum -= dp2[curr[l++]]; ^