Compilare: user.cpp: In function ‘void calc(std::vector<std::map<int, int> >, int, int)’: user.cpp:24:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr = 0; ^ user.cpp: In function ‘int main()’: user.cpp:49:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.in", "r", stdin); ^ user.cpp:50:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.out", "w", stdout); ^ user.cpp:54:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &N, &M, &K); ^ user.cpp:60:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d", &i1, &j1, &i2, &j2, &x); ^