Compilare: main.cpp: In function 'int main()': main.cpp:109:9: warning: unused variable 'val' [-Wunused-variable] int val = mn[n]; ^~~ main.cpp:92:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("fmcm.in", "r", stdin); ^ main.cpp:93:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("fmcm.out", "w", stdout); ^ main.cpp:95:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &m, &s, &d); ^ main.cpp:98:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &a, &b, &c, &d); ^