Compilare: main.cpp: In function 'int main()': main.cpp:34:6: warning: unused variable 'i' [-Wunused-variable] {int i,j,sol = 0; ^ main.cpp:34:8: warning: unused variable 'j' [-Wunused-variable] {int i,j,sol = 0; ^ main.cpp:35:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ main.cpp:37:32: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(c + 1, m + 2, in); ^