Compilare: main.cpp: In function 'void Read()': main.cpp:20:43: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d" , &N , &M , &Questions); ^ main.cpp:28:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c" , &Matrix[i][j]); ^ main.cpp: In function 'int main()': main.cpp:64:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("concurs.in" , "r" ,stdin); ^