Compilare: user.cpp: In function ‘int main()’: user.cpp:18:34: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] vector<vector<int>> lenpath(1<<n-1, vector<int>(n-1, oo)); ^ user.cpp:22:32: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for (int mask = 1; mask < 1<<n-1; mask++) { ^ user.cpp:34:31: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] ans = min(ans, lenpath[(1<<n-1)-1][i]+adjm[n-1][i]); ^ user.cpp:8:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.in", "r", stdin); ^ user.cpp:9:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.out", "w", stdout); ^