Compilare: user.cpp: In function ‘std::vector<int> add(std::vector<int>, std::vector<int>)’: user.cpp:13:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < a.size()) ^ user.cpp:15:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < b.size()) ^ user.cpp: In function ‘int main()’: user.cpp:41:29: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dp[i & 1][0] = dp[1 - i & 1][1]; ^ user.cpp:42:33: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dp[i & 1][1] = add(dp[1 - i & 1][0], dp[1 - i & 1][2]); ^ user.cpp:42:51: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dp[i & 1][1] = add(dp[1 - i & 1][0], dp[1 - i & 1][2]); ^ user.cpp:43:33: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dp[i & 1][2] = add(dp[1 - i & 1][1], dp[1 - i & 1][3]); ^ user.cpp:43:51: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dp[i & 1][2] = add(dp[1 - i & 1][1], dp[1 - i & 1][3]); ^ user.cpp:44:33: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dp[i & 1][3] = add(dp[1 - i & 1][4], dp[1 - i & 1][2]); ^ user.cpp:44:51: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dp[i & 1][3] = add(dp[1 - i & 1][4], dp[1 - i & 1][2]); ^ user.cpp:45:29: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dp[i & 1][4] = dp[1 - i & 1][3]; ^ user.cpp:36:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^