Compilare: main.cpp: In function 'int main()': main.cpp:14:11: warning: unused variable 'IN' [-Wunused-variable] FILE *IN = fopen("map.in","r"); ^~ main.cpp:15:11: warning: unused variable 'OUT' [-Wunused-variable] FILE *OUT = fopen("map.out","w"); ^~~ main.cpp:17:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &M); ^ main.cpp:20:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", S + 1); ^