Compilare: main.cpp: In function 'void solvec1()': main.cpp:14:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:18:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %c",&a,&c); ^ main.cpp: In function 'void solvec2()': main.cpp:54:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ main.cpp:62:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a); ^ main.cpp: In function 'int main()': main.cpp:106:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&c); ^ main.cpp: In function 'void solvec2()': main.cpp:77:15: warning: 'col1' may be used uninitialized in this function [-Wmaybe-uninitialized] viz[1][col1]=true; ~~~~~~~~~~~~^~~~~