Compilare: user.cpp: In function ‘std::pair<int, int> querry(int, int, int)’: user.cpp:38:19: warning: unused variable ‘sol12’ [-Wunused-variable] int sol1,sol2,sol12,sol22; ^ user.cpp:38:25: warning: unused variable ‘sol22’ [-Wunused-variable] int sol1,sol2,sol12,sol22; ^ user.cpp: In function ‘int main()’: user.cpp:82:22: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] car[i][j]=NULL; ^ user.cpp:50:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("poveste.in","r",stdin); ^ user.cpp:51:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("poveste.out","w",stdout); ^ user.cpp:52:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&T); ^ user.cpp:55:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&N,&M); ^ user.cpp:57:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",car[i]+1); ^