Compilare: user.cpp: In function ‘int main()’: user.cpp:40:23: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings] read("concert2.in"); ^ user.cpp: In function ‘void read(char*)’: user.cpp:7:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(file, "r", stdin); ^ user.cpp:8:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n", &n, &k1, &k2); ^ user.cpp:10:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &a[i]); ^