Compilare: user.cpp: In function ‘void part2()’: user.cpp:114:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (st.find(make_pair(i, j)) != st.end()) ^ user.cpp: In function ‘int main()’: user.cpp:145:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri2.in", "r", stdin); ^ user.cpp:146:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri2.out", "w", stdout); ^ user.cpp:148:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:153:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^