Compilare: user.cpp: In function ‘bool check(int, int)’: user.cpp:55:9: warning: unused variable ‘last’ [-Wunused-variable] int last = 0; ^ user.cpp:56:9: warning: unused variable ‘PMax’ [-Wunused-variable] int PMax = -1; ^ user.cpp: In function ‘void Solve(int, int)’: user.cpp:116:54: warning: variable ‘fr’ set but not used [-Wunused-but-set-variable] int left = Max, right = N - 1, mid, sol = N - 1, fr = -1, frr = -1; ^ user.cpp:116:63: warning: variable ‘frr’ set but not used [-Wunused-but-set-variable] int left = Max, right = N - 1, mid, sol = N - 1, fr = -1, frr = -1; ^ user.cpp: In function ‘void DFS(int)’: user.cpp:160:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp:167:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void printSolution()’: user.cpp:193:13: warning: unused variable ‘cnt’ [-Wunused-variable] int cnt = 0; ^ user.cpp: In function ‘int main()’: user.cpp:220:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("optic.out", "w", stdout); ^