Compilare: user.cpp: In function ‘int solve1(int, int)’: user.cpp:22:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[c].size(); ++i) ^ user.cpp: In function ‘int solve2(int, int)’: user.cpp:44:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(v[a].size() == 1) ^ user.cpp:49:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(v[a].size() == 2) ^ user.cpp: In function ‘int main()’: user.cpp:188:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri4.out", "w", stdout); ^