Compilare: user.cpp: In function ‘void update(int, int, int, int, int)’: user.cpp:38:9: warning: unused variable ‘i’ [-Wunused-variable] int i , j , mij; ^ user.cpp:38:13: warning: unused variable ‘j’ [-Wunused-variable] int i , j , mij; ^ user.cpp: In function ‘long long int interogare(int, int, int, int, int)’: user.cpp:57:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < arb[nod].size(); ++i) sol.insert(arb[nod][i]); ^ user.cpp: In function ‘int main()’: user.cpp:147:38: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if (arb[nod].empty() && left <= NR & right <= NR) ^ user.cpp:150:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 , j = 0; i < arb[left].size() || j < arb[right].size(); ) ^ user.cpp:150:77: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 , j = 0; i < arb[left].size() || j < arb[right].size(); ) ^ user.cpp:152:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < arb[left].size() && j < arb[right].size() && arb[left][i] < arb[right][j]) ^ user.cpp:152:65: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < arb[left].size() && j < arb[right].size() && arb[left][i] < arb[right][j]) ^ user.cpp:156:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (i < arb[left].size() && j < arb[right].size()) ^ user.cpp:156:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (i < arb[left].size() && j < arb[right].size()) ^ user.cpp:160:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (i < arb[left].size()) ^ user.cpp:121:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana2.in","r",stdin); ^ user.cpp:122:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana2.out","w",stdout); ^ user.cpp:124:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:128:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &A[i].x, &A[i].y); ^